BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Gravitational Wave Astronomy -- Avant le De'luge DTSTART;VALUE=DATE-TIME:20220919T070000Z DTEND;VALUE=DATE-TIME:20220919T080000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-874@events.ncbj.gov.pl DESCRIPTION:Speakers: Keith Riles ( University of Michigan )\nThe era of g ravitational-wave (GW) astronomy is now well under way\, with nearly 100 c ompact binary coalescences (CBCs) confidently detected in the first three observing runs of LIGO and Virgo. With the fourth observing run of LIGO\, Virgo and KAGRA starting in early 2023\, it is timely to review what has b een learned so far\, both from the CBC events and from the absence of othe r types of GW detections\, including continuous and stochastic radiation. Prospects for making such new discoveries soon will be discussed\, along w ith the potential insights to be gained from the deluge of CBC events expe cted in the coming years and decades.\n\nhttps://events.ncbj.gov.pl/event/ 152/contributions/874/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/874/ END:VEVENT BEGIN:VEVENT SUMMARY:CANCELLED Compactification of the phase space in the scalar field cosmology with non-minimal coupling DTSTART;VALUE=DATE-TIME:20220923T125000Z DTEND;VALUE=DATE-TIME:20220923T131000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-941@events.ncbj.gov.pl DESCRIPTION:Speakers: Franciszek Humieja ( Jagiellonian University )\nWe i nvestigate the FLRW cosmological model with a non-minimally coupled scalar field generalized according to the methods given by the nonlinear field s pace theory. In this approach\, one generalizes the phase space of a given field to a topological space (such as symplectic manifold). We consider t he compactification of the phase space to a spherical case\, corresponding to a spin system\, and analyze the evolutionary scenarios of such a model of the universe. Introduction of the non-minimal coupling in the model pr ovides interesting outcome in the dynamics of the late time acceleration.\ n\nhttps://events.ncbj.gov.pl/event/152/contributions/941/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/941/ END:VEVENT BEGIN:VEVENT SUMMARY:Low scale inflation without (much of) fine-tuning DTSTART;VALUE=DATE-TIME:20220923T091000Z DTEND;VALUE=DATE-TIME:20220923T094000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-939@events.ncbj.gov.pl DESCRIPTION:Speakers: Michał Artymowski (UKSW)\nIn my talk\, I will argue that the GUT scale is the most natural scale for inflation. I will show w hy we may actually need to go much lower and why this may cause massive fi ne-tuning. Finally\, I will present a possible solution - warm inflation w ith (almost) arbitrarily low energy scale.\n\nhttps://events.ncbj.gov.pl/e vent/152/contributions/939/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/939/ END:VEVENT BEGIN:VEVENT SUMMARY:Opening remarks DTSTART;VALUE=DATE-TIME:20220919T065000Z DTEND;VALUE=DATE-TIME:20220919T070000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-951@events.ncbj.gov.pl DESCRIPTION:https://events.ncbj.gov.pl/event/152/contributions/951/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/951/ END:VEVENT BEGIN:VEVENT SUMMARY:Jet structure and variability studies of GRBs with 3D GRMHD simula tions of magnetically arrested disks DTSTART;VALUE=DATE-TIME:20220920T145000Z DTEND;VALUE=DATE-TIME:20220920T151000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-898@events.ncbj.gov.pl DESCRIPTION:Speakers: Bestin James ( Center for Theoretical Physics PAS )\ nWe study the structure and temporal variabilty properties of the GRB jets considering a magnetically arrested disk as their central engine. We nume rically evolve the accretion disk around a Kerr black hole using 3D genera l relativistic magnetohydrodynamic simulations. We consider two analytical equillibrium disk configurations\, the Fishbone-Moncrief and Chakrabarti solutions\, as the initial conditions and impose poloidal magnetic fields upon them. The disk starts accreting due to the development of the magneto rotational instability and eventually develops to a magnetically arrested accretion disk state. We consider these models as central engines of short and long-GRBs\, based on our initial conditions\, and investigate the pro perties of the jets launched from these models. Our models self-consistent ly produce structured jets with a hollow core up to ~ 5 degrees. The jets from our simulations have an opening angle up to ~ 11 degrees for the long -GRB model and up to ~ 25 degrees for the short-GRB model. We also do the time variabilty studies of the jets and provide an estimate of their minim um variabilty timescales. Our models can be applied to the GRB jets in the binary neutron star post-merger system or to the ultra-relativistic jets launched from collapsing stars.\n\nhttps://events.ncbj.gov.pl/event/152/co ntributions/898/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/898/ END:VEVENT BEGIN:VEVENT SUMMARY:Optical distance measures in general relativity DTSTART;VALUE=DATE-TIME:20220920T140000Z DTEND;VALUE=DATE-TIME:20220920T143000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-896@events.ncbj.gov.pl DESCRIPTION:Speakers: Mikołaj Korzyński ( CFT PAN )\nI will discuss the relation between the angular diameter distance and parallax distance i n general relativity. This relation involves the curvature tensor along th e line of sight and the difference between distance measures can be used t o measure the matter content along the line of sight. Moreover\, it is als o possible to prove that the parallax distance must be not smaller than th e angular diameter distance if the null energy condition holds. I will dis cuss possible astrophysical and cosmological application of these results. \n\nhttps://events.ncbj.gov.pl/event/152/contributions/896/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/896/ END:VEVENT BEGIN:VEVENT SUMMARY:Stiffness\, complexity\, cracking and stability of relativistic co mpacts stars DTSTART;VALUE=DATE-TIME:20220920T131000Z DTEND;VALUE=DATE-TIME:20220920T133000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-895@events.ncbj.gov.pl DESCRIPTION:Speakers: Ranjan Sharma ( Cooch Behar Panchanan Barma Universi ty )\nCurrent multi-messenger approach has made it possible to get a much more precise estimation of stellar observables like mass $M$ and radius $R $ of a neutron star which consequently can help us constrain the neutron s tar equation of state (EOS) like never before. Theoretical stellar models are being refined accordingly. Using Chandrasekhar's variational method\, we examine the dynamical stability of a recently proposed modified Tolman VII solution that can accommodate a more realistic neutron star EOS consis tent with observational data. We note that the critical value of compactne ss ($M/R$) at which instability develops within the configuration decrease s with the stiffness increase of the assumed EOS. The critical bound remai ns below the Buchdahl bound throughout. We further invoke the concepts of 'cracking' and 'complexity' in the stability analysis of an anisotropic st ellar configuration. We show that for a static\, spherically symmetric\, a nisotropic distribution of matter with radially decreasing energy density possessing zero 'complexity'\, the tangential pressure must be greater tha n the radial pressure at all interior points of a potentially stable stell ar configuration.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/89 5/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/895/ END:VEVENT BEGIN:VEVENT SUMMARY:Recovery schemes in numerical GR MHD simulation of the post-merger system with a composition-dependent equation of state DTSTART;VALUE=DATE-TIME:20220920T120000Z DTEND;VALUE=DATE-TIME:20220920T123000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-890@events.ncbj.gov.pl DESCRIPTION:Speakers: Agnieszka Janiuk ( Center for Theoretical Physics PA S )\nThe code HARM_COOL\, a conservative scheme for relativistic magnetohy drodynamics\, is being developed in our group and works with a tabulated e quation of state of dense matter. This EOS can be chosen and used during d ynamical simulation\, instead of the simple ideal gas one. In this case\, the inversion scheme between the conserved and primitive variables is not a trivial task. In principle\, the code needs to solve numerically five co upled non-linear equations at every time-step. The 5-D recovery schemes we re originally implemented in HARM and worked accurately for a simple polyt ropic EOS which has an analytic form. Our current simulations support the composition-dependent EOS\, formulated in terms of rest-mass density\, tem perature and electron fraction. I will discuss and compare several recover y schemes that have been included in our code. I will present and discuss their convergence tests. I will also show some preliminary results of a nu merical simulation\, addressed to the post-merger system formed after the coalescence of binary neutron stars.\n\nhttps://events.ncbj.gov.pl/event/1 52/contributions/890/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/890/ END:VEVENT BEGIN:VEVENT SUMMARY:A new generic and structurally stable cosmological model without s ingularity DTSTART;VALUE=DATE-TIME:20220919T145000Z DTEND;VALUE=DATE-TIME:20220919T151000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-887@events.ncbj.gov.pl DESCRIPTION:Speakers: Orest Hrycyna (NCBJ)\nDynamical systems methods are used to investigate a cosmological model with non-minimally coupled scalar field and asymptotically quadratic potential function. We found that for values of the non-minimal coupling constant parameter $\\frac{3}{16}\n\nht tps://events.ncbj.gov.pl/event/152/contributions/887/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/887/ END:VEVENT BEGIN:VEVENT SUMMARY:Newtonian regime and topology: consequence for the role of spatial curvature in cosmology DTSTART;VALUE=DATE-TIME:20220919T143000Z DTEND;VALUE=DATE-TIME:20220919T145000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-886@events.ncbj.gov.pl DESCRIPTION:Speakers: Quentin Vigneron ( Copernicus University\, Torun )\n The standard model of cosmology currently allows for three types of geomet ries (or topologies) for our Universe (Euclidean\, spherical or hyperbolic )\, each of these types corresponding to a set of different (multiconnecte d)-topologies. Among these geometries\, Newton’s theory of gravity is on ly defined on the Euclidean one. Still\, extending the validity of this th eory to the other two cases (called a non-Euclidean Newtonian theory)\, wi th the aim that this should constitute the limit of a relativistic theory of gravity\, could provide a strong theoretical tool to probe large scale effects of global topology. We will see that Einstein's equation is actual ly incompatible with such a theory. Therefore this equation must be modifi ed in the hypothesis where we require the relativistic theory describing o ur Universe to be compatible with the presence of a Newtonian regime in an y topology. I will present such a modification which is based on Rosen's b i-metric theory. Its main consequence is that the expansion law of a homog eneous and isotropic solution no longer features the spatial curvature (i. e. $\\Omega = 1\, \\ \\forall \\Omega_k$)\, asking for a reevaluation of t hat curvature from cosmological data.\n\nhttps://events.ncbj.gov.pl/event/ 152/contributions/886/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/886/ END:VEVENT BEGIN:VEVENT SUMMARY:Effective banks of templates in detection of almost monochromatic gravitational waves DTSTART;VALUE=DATE-TIME:20220919T120000Z DTEND;VALUE=DATE-TIME:20220919T122000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-880@events.ncbj.gov.pl DESCRIPTION:Speakers: Andrzej Pisarski ( University of Bialystok )\nProble m of finding effective banks of templates is very important in match filte ring method used in detection of almost monochromatic gravitational waves coming from single rotating neutron stars located in our Galaxy. Construct ion of effective banks of templates requires finding optimal grid covering s in the space spanned by unknown parameters of the gravitational-wave sig nal we are looking for. Such coverings can be generated by the software '' Grids Generator'' devised by me. In my talk\, I will show some results pro duced by this software and explain in more detail one of the algorithms us ed to generate effective grid coverings.\n\nhttps://events.ncbj.gov.pl/eve nt/152/contributions/880/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/880/ END:VEVENT BEGIN:VEVENT SUMMARY:Gravitational waves on Riemann-Cartan geometries DTSTART;VALUE=DATE-TIME:20220919T095000Z DTEND;VALUE=DATE-TIME:20220919T101000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-878@events.ncbj.gov.pl DESCRIPTION:Speakers: Fernando Izaurieta ( Department of Physics\, Unive rsity of Concepcion )\nWe offer a mathematical toolkit for the study of wa ves propagating on a background manifold with nonvanishing torsion. As an example\, we briefly analyze the amplitude propagation of gravitational wa ves in an Einstein-Cartan-Sciamma-Kibble (ECSK) assuming a dark matter spi n tensor sourcing for spacetime torsion at cosmological scales and assess whether a future detection by LISA is possible.\n\nhttps://events.ncbj.gov .pl/event/152/contributions/878/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/878/ END:VEVENT BEGIN:VEVENT SUMMARY:Searching for gravitational-wave emission due to r-modes from the pulsar PSR J0537–6910 in LIGO O3 data. DTSTART;VALUE=DATE-TIME:20220919T093000Z DTEND;VALUE=DATE-TIME:20220919T095000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-877@events.ncbj.gov.pl DESCRIPTION:Speakers: Orest Dorosh (NCBJ)\nI shall present results of the search for gravitational wave emission due to r-modes for the pulsar PSR J 0537-6910 using data from the LIGO and Virgo ground based detectors in the O3 observing run. PSR J0537-6910 is a young X-ray pulsar and is currently the most frequent glitcher known. Its inter-glitch braking index suggests that gravitational wave emission due to r-modes may play an important rol e in the spindown of this pulsar. The times of the glitches during the O3 run were known from the timing ephemeris obtained from the NICER mission d ata. We searched for gravitational wave signals due to r-modes in the epoc hs between glitches. We do not detect any signals in the theoretically all owed band of 86-97 Hz\, and report upper limits on the amplitude of the gr avitational waves. Our upper limits place stringent constraints on theoret ical models for r-mode driven spin-down in PSR J0537−6910.\n\nhttps://ev ents.ncbj.gov.pl/event/152/contributions/877/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/877/ END:VEVENT BEGIN:VEVENT SUMMARY:BLACK HOLES BINARIES FROM GLOBULAR CLUSTERS as sources of gravitat ional waves DTSTART;VALUE=DATE-TIME:20220919T090000Z DTEND;VALUE=DATE-TIME:20220919T093000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-876@events.ncbj.gov.pl DESCRIPTION:Speakers: Dorota Rosinska ( OA\, University of Warsaw )\nWe an alyze about a thousand globular cluster (GC) models simulated using the MO CCA Monte Carlo code for star cluster evolution to study black hole - blac k hole interactions in these dense stellar sys- tems that can lead to grav itational wave emission. We extracted information for all coalescing binar y black holes (BBHs) that merge via gravitational ra- diation from these G C models and for those BHs that collide due to 2-body\, 3-body and 4-body dy- namical interactions. By obtaining results from a substantial number o f realistic star clusters evolu- tion models\, that cover different initia l parameters (masses\, metallicities\, densities etc) we have an ex- treme ly large statistical sample of two black holes which merge or collide with in a Hubble time. We found that creation of an Intermediate Mass Black Hol e (IMBH\, defined as a BH with mass above 100 M ) in a GC’s center has l arge influence on merger and collision rates.\n\nhttps://events.ncbj.gov.p l/event/152/contributions/876/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/876/ END:VEVENT BEGIN:VEVENT SUMMARY:Matter bounce and dynamical aspects in nonmetricity gravity DTSTART;VALUE=DATE-TIME:20220919T131000Z DTEND;VALUE=DATE-TIME:20220919T134000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-888@events.ncbj.gov.pl DESCRIPTION:Speakers: Bivudutta Mishra (BITS-Pilani\, Hyderabad Campus)\nI n the context of the late time cosmic acceleration phenomenon\, many geome trically modified theories of gravity have been proposed in recent times. In this paper\, we have investigated the role of a recently proposed exten sion of symmetric teleparallel gravity dubbed as $f(Q\,T)$ gravity in gett ing viable cosmological models\, where $Q$ and $T$ respectively denote the non-metricity and the trace of energy momentum tensor. We stress upon the mathematical simplification of the formalism in the $f(Q\,T)$ gravity and derived the dynamical parameters in more general form in terms of the Hub ble parameter. We considered two different cosmological models mimicking n on-singular matter bounce scenario. Since energy conditions play a vital r ole in providing bouncing scenario\, we have analyzed different possible e nergy conditions to show that strong energy condition and null energy cond ition be violated in this theory. The models considered in the work are va lidated through certain cosmographic tests and stability analysis.\n\nhttp s://events.ncbj.gov.pl/event/152/contributions/888/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/888/ END:VEVENT BEGIN:VEVENT SUMMARY:Electromagnetic and Gravitational Hopfion-like solutions in de Sit ter spacetime DTSTART;VALUE=DATE-TIME:20220922T072000Z DTEND;VALUE=DATE-TIME:20220922T074000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-919@events.ncbj.gov.pl DESCRIPTION:Speakers: Tomasz Smółka (University of Warsaw/AEI Max Planck )\nHopfions are a family of `solitonary’ field solutions which have non- trivial topological structure associated with Hopf fibration. I will prese nt a generalisation of such solutions\, based on conformal transformations \, to de Sitter spacetime. Two physical applications of Hopfion-like solut ions: electromagnetism and linear gravitation will be discussed.\n\nhttps: //events.ncbj.gov.pl/event/152/contributions/919/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/919/ END:VEVENT BEGIN:VEVENT SUMMARY:Examining Quasinormal Mode Instability with the Pseudospectrum DTSTART;VALUE=DATE-TIME:20220922T070000Z DTEND;VALUE=DATE-TIME:20220922T072000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-918@events.ncbj.gov.pl DESCRIPTION:Speakers: Brad Cownden (Jagiellonian University)\nQuasinormal modes (QNMs) are the exponentially damped\, oscillatory solutions to linea rized wave equations that appear in a variety of physical contexts. Most n otably\, the gravitational waves emitted during the ringdown phase of the merger of two compact objects\, such as neutron stars or black holes\, are characterized by QNMs. The frequencies of the QNMs encode information abo ut the relic object such as mass and spin\, and -- in the most energetic c ases -- are sensitive to higher-curvature corrections to general relativit y. The stability of a QNM depends on how its frequency changes in response to perturbations\; the pseudospectrum allows us to examine the stability of all the QNMs to a specific perturbation of the background. In this talk \, I will review how the pseudospectrum is used to examine the stability o f the QNMs of Schwarzschild and Kerr black holes. I will then discuss how these methods can be applied to the stability of QNMs for classical solito n solutions.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/918/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/918/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum dynamics of relativistic systems DTSTART;VALUE=DATE-TIME:20220922T130000Z DTEND;VALUE=DATE-TIME:20220922T132000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-925@events.ncbj.gov.pl DESCRIPTION:Speakers: Przemysław Małkiewicz (NCBJ)\nThe appearance of Ha miltonian constraint in the canonical formalism for general relativity ref lects the lack of any preferred notion of time. The dynamics of general re lativistic systems can be equivalently expressed with respect to various i nternal degrees of freedom. However\, quantization of general relativistic systems breaks down the diffeomorphism invariance and different time vari ables generally yield inequivalent quantum dynamics. We investigate the se nse in which these inequivalent quantum dynamics could be reconciled. Our result is illustrated with the dynamics of gravitational waves in a quanti sed universe.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/925/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/925/ END:VEVENT BEGIN:VEVENT SUMMARY:The most massive galaxy clusters DTSTART;VALUE=DATE-TIME:20220919T141000Z DTEND;VALUE=DATE-TIME:20220919T143000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-885@events.ncbj.gov.pl DESCRIPTION:Speakers: Jan Ostrowski (NCBJ)\nExtreme bound objects are impo rtant probes of the large-scale Universe. The abundance and certain parame ters of the most massive (super-) clusters of galaxies put constraints on the cosmological parameters and the background evolution. In my talk I wil l present two approaches\, one [1] based on the exact solution to Einstein 's equations and a complementary one [2]\, based on the relativistic\, La grangian perturbation theory. Both allow to derive an observationally-veri fiable predictions regarding the biggest\, gravitationally bounded struct ures. Comparison with observations will be summarized and put into perspec tive.\n \nReferences\n[1] Bolejko K.\, Ostrowski J. J.\, The environm ent-dependence of the growth of the most massive objects in the Universe\, Phys. Rev. D 99\, 124036 (2019) [arXiv:1805.11047]\n[2] Ostrowski J.J.\, Delgado Gaspar I.\, On the maximum volume of collapsing structures\, JCAP\ , 4\, 59 (2022) [arXiv:2112.05245]\n\nhttps://events.ncbj.gov.pl/event/152 /contributions/885/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/885/ END:VEVENT BEGIN:VEVENT SUMMARY:Rip Cosmological Models in Extended Symmetric Teleparallel Gravity . DTSTART;VALUE=DATE-TIME:20220923T140000Z DTEND;VALUE=DATE-TIME:20220923T142000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-943@events.ncbj.gov.pl DESCRIPTION:Speakers: Laxmipriya Pati ( BITS-Pilani\, Hyderabad Campus )\n In this work\, we have investigated some rip cosmological models in an ext ended symmetric teleparallel gravity theory. We consider the form f (Q\, T ) = aQ^m+bT in the Einstein–Hilbert action and expressed the field equa tions and the dynamical parameters in terms of the non-metricity Q. Three rip models such as Little Rip\, Big Rip\, and Pseudo Rip are presented als o the energy conditions and the cosmographic parameters are derived and an alyzed for all these models.\n\nhttps://events.ncbj.gov.pl/event/152/contr ibutions/943/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/943/ END:VEVENT BEGIN:VEVENT SUMMARY:Scalar-tensor cosmology in a minisuperspace formulation with Chapl ygin Gas DTSTART;VALUE=DATE-TIME:20220923T134000Z DTEND;VALUE=DATE-TIME:20220923T140000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-942@events.ncbj.gov.pl DESCRIPTION:Speakers: Marcin Postolak ( University of Wrocław )\nScalar t ensor theories (STT) of gravity are one of the most fundamental types of m odified theories of gravity. By introducing a non-minimally coupled dynami cal scalar field\, they make it possible to describe gravitational interac tion to the extent that the purely tensor general theory of relativity fai ls\, or does not give sufficiently accurate predictions. One of the ideas strongly developed in recent years regarding the attempt to describe the d ark sector of the universe is the so-called dark fluid. In its concept\, i t aims to unify in one physical phenomenon the influence of dark energy an d dark matter on the evolution of the universe. One example of such a flui d is the family of models of the so-called Chaplygin gas (CG) [1]\, which is characterized by a specific equation of state: p(ρ) = − A /ρ^α. By considering particular CG models as sources of matter in the Universe\, s pecific FLRW cosmological models in the minisuperspace (MSS) formalism can be obtained\, which can be presented in specific conformal frames\, such as the best known Einstein and Jordan frame. Classical mechanical systems in cosmology in the MSS formulation are proved to be extremely effective i n studying ST cosmological models [2]. During the talk I will present an a nalysis on the conservation laws of the energy-momentum tensor in the case of minimal and non-minimal coupling for metric and metric-hybrid STT\, as well as a numerical analysis to verify whether the obtained cosmological models can be an extension of the Λ-CDM model. References [1] M. C. Bento \, O. Bertolami\, and A. A. Sen\, Generalized Chaplygin gas\, acceler- ate d expansion\, and dark-energy-matter unification\, Phys. Rev. D 66\, 04350 7 (2002). [2] A. Borowiec\, A. Kozak\, Scalar-tensor cosmologies in a mini superspace formu- lation: A case study\, Phys. Rev. D 105\, 4 (2022).\n\nh ttps://events.ncbj.gov.pl/event/152/contributions/942/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/942/ END:VEVENT BEGIN:VEVENT SUMMARY:Metric-affine gravity effects on terrestrial (exo)planets' profile s DTSTART;VALUE=DATE-TIME:20220923T123000Z DTEND;VALUE=DATE-TIME:20220923T125000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-940@events.ncbj.gov.pl DESCRIPTION:Speakers: Aleksander Kozak ( University of Wrocław )\nExtende d gravity theories modify gravitational phenomena at various scales\, rang ing from cosmological to the scale of our Solar System. Given the multitud e of possible modifications\, it is essential to test the models at differ ent energy regimes. Gravity is well-tested here on Earth\; any deviations from general relativity (GR) should be miniscule\, which imposes some limi tations on possible extensions. As it turns out\, modified gravity has an influence on the internal structure of spherically-symmetric bodies\, such as (exo)planets. In principle\, it should be possible to constrain altern atives to GR using\, for example\, seismicvdata\, informing us of the size and composition of layers inside the Earth. In my talk\, I will present t he way alternative gravity can modify the structure of planets composed of one and two layers\, obtaining mass-radius relations of homogeneous and d ifferentiated cold spheres. An additional degeneracy in the (exo)planets' profiles will be discussed together with their properties concluded from o ur findings in the framework of Palatini f(R) gravity. Possible generaliza tions will also be discussed.\n\nhttps://events.ncbj.gov.pl/event/152/cont ributions/940/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/940/ END:VEVENT BEGIN:VEVENT SUMMARY:Challenging ΛCDM with scalar-tensor f(R\,T) gravity and thermodyn amics of irreversible matter creation DTSTART;VALUE=DATE-TIME:20220923T121000Z DTEND;VALUE=DATE-TIME:20220923T123000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-938@events.ncbj.gov.pl DESCRIPTION:Speakers: Miguel Pinto ( Institute of Astrophysics and Space S ciences - University of Lisbon )\nWe investigate the possibility of gravit ationally generated particle production via the mechanism of non-minimal c urvature-matter coupling. An intriguing feature of this theory is that the divergence of the matter energy-momentum tensor does not vanish identical ly. We explore the physical and cosmological implications of the non-conse rvation of the energy-momentum tensor by using the formalism of irreversib le thermodynamics of open systems in the presence of matter creation/annih ilation. The particle creation rates\, pressure\, temperature evolution an d the expression of the comoving entropy are obtained in a covariant formu lation and discussed in detail. Applied together with the gravitational fi eld equations\, the thermodynamics of open systems lead to a generalizatio n of the standard ΛCDM cosmological paradigm\, in which the particle crea tion rates and pressures are effectively considered as components of the c osmological fluid energy-momentum tensor. We also consider specific models \, and we compare the cosmology with a curvature-matter coupling with the ΛCDM scenario\, and if it additionally gives rise to particle creation ra tes\, creation pressures\, and entropy generation through gravitational ma tter production in both low and high redshift limits.\n\nhttps://events.nc bj.gov.pl/event/152/contributions/938/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/938/ END:VEVENT BEGIN:VEVENT SUMMARY:Cosmological perturbations beyond the linear order DTSTART;VALUE=DATE-TIME:20220923T102000Z DTEND;VALUE=DATE-TIME:20220923T104000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-936@events.ncbj.gov.pl DESCRIPTION:Speakers: Szymon Sikora ( Jagiellonian University )\nIn this t alk I will present the specific solution to the second-order cosmological perturbation theory. For the background I will consider any Friedmann-Lema itre-Robertson-Walker model filled with a dust\, and a positive cosmologic al constant. The presented model is a generalization of the previous resul ts obtained with Krzysztof Głód where the background was the Einstein-de Sitter spacetime. Here\, I investigate the case of the spatially non-flat background and a positive cosmological constant.\n\nhttps://events.ncbj.g ov.pl/event/152/contributions/936/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/936/ END:VEVENT BEGIN:VEVENT SUMMARY:Structure forming plane symmetric dust inhomogeneous cosmological model DTSTART;VALUE=DATE-TIME:20220923T100000Z DTEND;VALUE=DATE-TIME:20220923T102000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-935@events.ncbj.gov.pl DESCRIPTION:Speakers: Krzysztof Głód ( Jagiellonian University )\nWe pre sent a special case of the plane symmetric model from the G_3/S_2-symmetri c space-times solving the Einstein equations for a dust source which exhib its a controlled form of the growth of the matter density inhomogeneities. \n\nhttps://events.ncbj.gov.pl/event/152/contributions/935/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/935/ END:VEVENT BEGIN:VEVENT SUMMARY:Gauge-fixing and spacetime reconstruction in the Hamiltonian theor y of cosmological perturbations DTSTART;VALUE=DATE-TIME:20220923T094000Z DTEND;VALUE=DATE-TIME:20220923T100000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-934@events.ncbj.gov.pl DESCRIPTION:Speakers: Alice Boldrin (NCBJ)\nWe will present a general form alism for the Hamiltonian description of any spatially homogeneous spaceti me in perturbation theory. We will employ and refine the Dirac method for constrained systems\, which is very well-suited to cosmological perturbati ons. This approach includes a discussion of the gauge-invariant dynamics o f perturbations as well as an analysis of gauge transformations\, gauge-fi xing\, partial gauge-fixing and spacetime reconstruction. We will introduc e the Kuchař parametrization of the kinematical phase space as a convenie nt tool for studying the gauge transformations. The key element of this ap proach is the reconstruction of spacetime based on gauge-fixing conditions . Some examples for selected gauges will be presented.\n\nhttps://events.n cbj.gov.pl/event/152/contributions/934/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/934/ END:VEVENT BEGIN:VEVENT SUMMARY:The relativistic galaxy bispectrum DTSTART;VALUE=DATE-TIME:20220923T081000Z DTEND;VALUE=DATE-TIME:20220923T091000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-932@events.ncbj.gov.pl DESCRIPTION:Speakers: Chris Clarkson ( University of London )\nThe galaxy bispectrum will play an important role for future galaxy surveys. On large scales it will be a key probe for measuring primordial non-Gaussianity\, and hence help discriminate between different inflationary models and othe r theories of the early universe. On these scales\, a variety of relativis tic effects come into play once the galaxy number-count fluctuation is pro jected onto the past light cone. The Fourier-space galaxy bispectrum is co mplex\, with the imaginary part arising from leading-order relativistic co rrections. Detection of the imaginary part is potentially a smoking gun si gnal of relativistic contributions. We will discuss whether next-generatio n surveys could make such a detection. Further\, We will discuss the decom position of the bispectrum into invariant multipoles about the observer’ s line of sight\, and examine in detail how the relativistic effects contr ibute to these.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/932/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/932/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum simulations of loop quantum gravity DTSTART;VALUE=DATE-TIME:20220923T072000Z DTEND;VALUE=DATE-TIME:20220923T074000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-931@events.ncbj.gov.pl DESCRIPTION:Speakers: Grzegorz Czelusta ( Jagiellonian University )\nOne o f the possible applications of quantum computers in the near future are si mulations of physics. An example are quantum gravitational systems associa ted with the Planck scale physics. Such systems are expected to be of the many-body type\, which justifies utility of quantum computations in the an alysis of their complex quantum behaviour. In this talk\, simulation of lo op quantum gravity on quantum computer are considered. A construction of q uantum circuits which generate states of spin networks will be presented. Furthermore\, a quantum algorithms which enable projection of states on ph ysical subspace of Hilbert space and determination of amplitudes of transi tions between different states of spin network are proposed. Results of im plementation of the approach on IBM superconducting quantum computers will be presented. Obtained results provide building blocks for quantum simula tions of complex spin networks\, which can give insight into the Planck sc ale physics in the near future.\n\nhttps://events.ncbj.gov.pl/event/152/co ntributions/931/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/931/ END:VEVENT BEGIN:VEVENT SUMMARY:κ-deformed complex fields\, (discrete) symmetries\, and charges DTSTART;VALUE=DATE-TIME:20220923T070000Z DTEND;VALUE=DATE-TIME:20220923T072000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-930@events.ncbj.gov.pl DESCRIPTION:Speakers: Andrea Bevilacqua (NCBJ)\nIt is commonly expected th at the usual description of spacetime as a smooth manifold is no longer re liable as we approach the Planck scale when quantum effects of the geometr y can no longer be neglected. Noncommutativity of spacetime has been advoc ated as a possible way to effectively model quantum gravitational effects in regimes of negligible curvature. A widely studied incarnation of this i dea suggests that the scale of noncommutativity should be seen as an obser ver-independent length scale and that\, in order to accommodate such a fun damental scale\, ordinary relativistic symmetries should be deformed (keep ing in mind that they should reproduce the usual Poincaré algebra in the limit of vanishing noncommutativity). The κ-Poincaré algebra is an examp le of such deformation. In this talk I will briefly describe a constructio n of a κ-deformed complex scalar field theory\, while at the same time sh edding light on the behaviour of discrete and continuous symmetries in thi s formalism. This in turn will open the way to the study of the applicatio n of this formalism to actual physical processes. I will then conclude wit h some comments and prospects for the future.\n\nhttps://events.ncbj.gov.p l/event/152/contributions/930/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/930/ END:VEVENT BEGIN:VEVENT SUMMARY:Ascribing quantum system to Schwarzschild spacetime DTSTART;VALUE=DATE-TIME:20220922T124000Z DTEND;VALUE=DATE-TIME:20220922T130000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-929@events.ncbj.gov.pl DESCRIPTION:Speakers: Aleksandra Pędrak (NCBJ)\nI will present the quanti zation the Schwarzschild black hole using the affine coherent states quant ization method. The novelty of the approach is quantization of both tempor al and spatial coordinates. Quantization smears the gravitational singular ity indicated by the Kretschmann invariant avoiding its localization in th e configuration space. This way we resolve\, to some extent\, the singular ity problem of considered black hole. The approach relies on using only th e metric tensor so that it can be applied to other black holes with the me trics satisfying Einstein's equation.\n\nhttps://events.ncbj.gov.pl/event/ 152/contributions/929/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/929/ END:VEVENT BEGIN:VEVENT SUMMARY:Integral quantization and quantum time DTSTART;VALUE=DATE-TIME:20220922T122000Z DTEND;VALUE=DATE-TIME:20220922T124000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-928@events.ncbj.gov.pl DESCRIPTION:Speakers: Andrzej Góźdź ( Institute of Physics UMCS )\nQuan tization of classical models is a non-unique and heuristic procedure. A se t of different\, in fact non-equivalent approaches is known. In the talk s ome principles of the integral quantization method is presented. The simpl est integral quantization procedure is based on decomposition of unity in the Hilbert state space. More sophisticated way of thinking in this direct ion is related to the so called Quantum Motion Algebras. One of the unique property of the integral quantization is a possibility to treat physical time on the same footing as the space coordinates. This allows for constru ction of the covariant quantum spacetime position observable. In this case \, instead of the unitary time evolution\, other operators\, usually proje ction or POVM operators which map the space of initial states into the spa ce of final states at each step of the evolution can be used. The quantum evolution itself is a stochastic process. This allows to treat time as a q uantum observable in a~consistent\, observer independent way\, which is a very important and required feature to resolve some quantum paradoxes and the time problem in cosmology. Changing ''parameter time'' into ''quantum observable time'' seems to be a good step to combine relativity and quantu m mechanics.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/928/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/928/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantum chaos of the Belinski-Khalatnikov-Lifshitz scenario DTSTART;VALUE=DATE-TIME:20220922T120000Z DTEND;VALUE=DATE-TIME:20220922T122000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-927@events.ncbj.gov.pl DESCRIPTION:Speakers: Włodzimierz Piechocki (NCBJ)\nWe quantize the solut ion to the Belinski-Khalatnikov-Lifshitz scenario using the affine coheren t states quantization method. Quantization smears the gravitational singul arity avoiding its localization in the configuration space. Classical chao tic behavior of the BKL scenario becomes enhanced at the quantum level. Ou r results strongly suggest that the generic singularity of general relativ ity can be avoided at quantum level.\n\nhttps://events.ncbj.gov.pl/event/1 52/contributions/927/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/927/ END:VEVENT BEGIN:VEVENT SUMMARY:Universality and scaling in the collapse of spherical scalar field s in semiclassical loop quantum gravity DTSTART;VALUE=DATE-TIME:20220922T135000Z DTEND;VALUE=DATE-TIME:20220922T145000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-924@events.ncbj.gov.pl DESCRIPTION:Speakers: Jorge Pullin ()\nWe explore the phenomena first desc ribed by Choptuik\nof universality and scaling in the collapse of minimall y\ncoupled spherically symmetric scalar fields with the \neffective semicl assical equations of loop quantum gravity.\nContrary to expectations and s ome previous analyses\,\nwe find universality and scaling like those seen in classical\ngeneral relativity.\n\nhttps://events.ncbj.gov.pl/event/152/ contributions/924/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/924/ END:VEVENT BEGIN:VEVENT SUMMARY:Mixmaster universe: semiclassical dynamics and inflation from boun cing DTSTART;VALUE=DATE-TIME:20220922T101000Z DTEND;VALUE=DATE-TIME:20220922T103000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-923@events.ncbj.gov.pl DESCRIPTION:Speakers: Jaime de Cabo Martín (NCBJ)\nIn this work we expl ore the quantum Bianchi type IX-model\, its semi-classical features\, and its relevance in early cosmology to tentatively explain inflation and prod uction of primordial structures. We specially focus on the analytical and numerical exploration of the dynamical system derived from the phase-space portraits. Afterwards we investigate the reliability of our results with regard to inflation and post inflation scenarii commonly accepted nowadays .\n\nhttps://events.ncbj.gov.pl/event/152/contributions/923/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/923/ END:VEVENT BEGIN:VEVENT SUMMARY:3d gravity\, point particles and deformed symmetries DTSTART;VALUE=DATE-TIME:20220922T095000Z DTEND;VALUE=DATE-TIME:20220922T101000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-922@events.ncbj.gov.pl DESCRIPTION:Speakers: Tomasz Trześniewski ( University of Wroclaw )\nt is well known that gravity in 2+1 dimensions can be recast as the Chern-Simo ns theory\, with the gauge group given by the local isometry group\, depen ding on the metric signature and the cosmological constant. Point particle s are added into spacetime as (spinning) conical defects. Then\, in princi ple\, one may integrate out the gravitational degrees of freedom to obtain the effective particle action\; the most interesting consequence is that the momentum space of a particle turns out to be curved. This is still not completely understood in the case of non-zero cosmological constant. Mean while\, quantisation of the theory consists in the Hopf-algebraic deformat ion of the Poisson structure\, which is determined by a given classical r- matrix associated with the gauge algebra. All such possible r-matrices hav e recently been classified. One of the remaining open questions is whether the widely-studied kappa-Poincare algebra (associated with noncommutative kappa-Minkowski space) actually plays a physical role here.\n\nhttps://ev ents.ncbj.gov.pl/event/152/contributions/922/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/922/ END:VEVENT BEGIN:VEVENT SUMMARY:Non-extensive Thermodynamics of Black Holes DTSTART;VALUE=DATE-TIME:20220922T093000Z DTEND;VALUE=DATE-TIME:20220922T095000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-921@events.ncbj.gov.pl DESCRIPTION:Speakers: Hussain Gohar ()\nHawking temperature has been widel y utilized in the literature as the temperature corresponding to various n onextensive entropies. In this talk\, I will talk about the compatibility of Hawking temperature with the nonextensive entropies and demonstrate tha t\, for every nonextensive entropy\, one may define an effective temperatu re by utilizing the equilibrium condition\, and that there is always an ad ditive equilibrium entropy associated with this effective temperature.\n\n https://events.ncbj.gov.pl/event/152/contributions/921/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/921/ END:VEVENT BEGIN:VEVENT SUMMARY:Generalized Uncertainty Principle and Nonextensive Entropies DTSTART;VALUE=DATE-TIME:20220922T091000Z DTEND;VALUE=DATE-TIME:20220922T093000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-920@events.ncbj.gov.pl DESCRIPTION:Speakers: Mariusz P. Dąbrowski ( University of Szczecin )\n I will discuss the extensions of Heisenberg Uncertainty Principle onto the gravitational interaction both in small (generalized) and large (extended ) scales. Then I will review our results related to the GUP in various non extensive thermodynamics of black hole and cosmological horizons.\n\nhttps ://events.ncbj.gov.pl/event/152/contributions/920/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/920/ END:VEVENT BEGIN:VEVENT SUMMARY:Scalar curvature operator for loop quantum gravity on a cubical gr aph DTSTART;VALUE=DATE-TIME:20220922T082000Z DTEND;VALUE=DATE-TIME:20220922T084000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-917@events.ncbj.gov.pl DESCRIPTION:Speakers: Ilkka Makinen ( University of Warsaw )\nWe introduce a new operator representing the three-dimensional scalar curvature in loo p quantum gravity. The classical starting point of our construction is to express the Ricci scalar directly as a function of the Ashtekar variables. The construction does not apply to the entire Hilbert space of loop quant um gravity\; instead\, the operator is defined on the Hilbert space of a f ixed cubical graph. As such\, the operator is relevant to approaches such as algebraic quantum gravity\, quantum-reduced loop gravity and models of effective dynamics. (Jerzy Lewandowski\, Ilkka Mäkinen\, arXiv:2110.10667 )\n\nhttps://events.ncbj.gov.pl/event/152/contributions/917/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/917/ END:VEVENT BEGIN:VEVENT SUMMARY:Fermion coupling in Loop Quantum gravity DTSTART;VALUE=DATE-TIME:20220922T080000Z DTEND;VALUE=DATE-TIME:20220922T082000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-916@events.ncbj.gov.pl DESCRIPTION:Speakers: Cong Zhang ( University of Warsaw )\nIn the model of a fermion field coupled to loop quantum gravity\, we consider the Gauss a nd the Hamiltonian constraints. According to the explicit solutions to the Gauss constraint\, the fermion spins and the gravitational spin networks intertwine with each other so that the fermion spins contribute to the vol ume of the spin network vertices. For the Hamiltonian constraint\, the reg ularization and quantization procedures are presented in detail. By introd ucing an adapted vertex Hilbert space to remove the regulator\, we propose a diffeomorphism covariant graph-changing Hamiltonian constraint operator of the fermion field. This operator shows how fermions move in the loop q uantum gravity spacetime and simultaneously influences the background quan tum geometry. Moreover\, as an innovation of our work\, introducing the ve rtex Hilbert space also fixes issues so that a densely defined symmetric H amiltonian constraint operator can be obtained. (Jerzy Lewandowski\, Cong Zhang\, arXiv:2112.08865)\n\nhttps://events.ncbj.gov.pl/event/152/contribu tions/916/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/916/ END:VEVENT BEGIN:VEVENT SUMMARY:Matter fields in loop quantum gravity DTSTART;VALUE=DATE-TIME:20220922T074000Z DTEND;VALUE=DATE-TIME:20220922T080000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-915@events.ncbj.gov.pl DESCRIPTION:Speakers: Mehdi Assanioussi ( Faculty of Physics\, University of Warsaw )\nThe talk concerns the current status of matter fields in the framework of loop quantum gravity\, with an emphasis on the recent develop ments. The presentation will particularly focus on the r-Fock representati ons and their relation to the standard loop representations\, in light of the recent generalization of the construction of r-Fock measures to SU(N) gauge theories\, and how one could try bridging the gap between quantum fi eld theory on Minkowski spacetime and the background independent framework of loop quantum gravity.\n\nhttps://events.ncbj.gov.pl/event/152/contribu tions/915/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/915/ END:VEVENT BEGIN:VEVENT SUMMARY:Scalarization in Einsteinian Cubic Gravity with General Relativity as a cosmic attractor DTSTART;VALUE=DATE-TIME:20220921T143000Z DTEND;VALUE=DATE-TIME:20220921T145000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-914@events.ncbj.gov.pl DESCRIPTION:Speakers: Cristian Erices ( Universidad Central de Chile )\nWe address the issue of black hole scalarization and its compatibility with cosmic inflation and big bang cosmology from an effective field theory (EF T) point of view. In practice\, using a well-defined and healthy toy model which (in part) has been broadly considered in the literature\, we consid er how higher-order theories of gravity\, up to cubic operators in Riemann curvature\, fit within this context. Interestingly enough\, we find that already at this minimal level\, there is a non-trivial interplay between t he Wilson coefficients which are otherwise completely independent\, constr aining the parameter space where scalarization may actually occur. Conclus ively\, we claim that the EFT does exhibit black hole scalarization\, rema ining compatible with the inflationary paradigm\, and admitting General Re lativity as a cosmological attractor.\n\nhttps://events.ncbj.gov.pl/event/ 152/contributions/914/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/914/ END:VEVENT BEGIN:VEVENT SUMMARY:Halilsoy spacetime DTSTART;VALUE=DATE-TIME:20220921T141000Z DTEND;VALUE=DATE-TIME:20220921T143000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-913@events.ncbj.gov.pl DESCRIPTION:Speakers: Sebastian Szybka ( Jagiellonian University )\nThe Ha lilsoy solution corresponds to cross-polarized standing gravitational wave s in cylindrical symmetry. In my talk\, I will present recent results on t he structure of this spacetime and particles' orbits.\n\nhttps://events.nc bj.gov.pl/event/152/contributions/913/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/913/ END:VEVENT BEGIN:VEVENT SUMMARY:Existence of potential for linearized Weyl tensor as a generalized Poincare lemma DTSTART;VALUE=DATE-TIME:20220921T132000Z DTEND;VALUE=DATE-TIME:20220921T134000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-912@events.ncbj.gov.pl DESCRIPTION:Speakers: Marian Wiatr ( University of Warsaw\, Faculty of Phy sics )\nLinearized gravity could be treated as a linear theory of a field having symmetries of the Weyl tensor (spin-2 field). To obtain linearized gravity equations in this formulation from a variational formula\, it is n ecessary to have a guarantee of the existence of potential for every spin- 2 field. This problem is known as an existence of Lanczos potential\, whic h has been fully solved by F. Bampi and G. Caviglia in 1983. I will show t hat behind this problem lies the elegant mathematical structure of the N-c omplex of traceless tensor fields of given Young symmetry (which is a gene ralization of the de Rham complex of differential forms). The main result presented in the talk will be the fact that existence of potential for spi n-2 field is a strict consequence of the generalized Poincare lemma for so me N-complex of tensor fields\, analogically to classical electrodynamics. \n\nhttps://events.ncbj.gov.pl/event/152/contributions/912/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/912/ END:VEVENT BEGIN:VEVENT SUMMARY:Spherical and Non-spherical collapse of a finite two-layer body DTSTART;VALUE=DATE-TIME:20220921T130000Z DTEND;VALUE=DATE-TIME:20220921T132000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-911@events.ncbj.gov.pl DESCRIPTION:Speakers: Prakash Sarnobat ( East Surrey Gravity Research )\nW e study the simplest possible analytical model for spherical collapse that involves density variations\, that of a homogeneous core surrounded by a different homogeneous layer\, where both are joined using the Darmois matc hing conditions. The aim is to obtain an analytical expression for whether or not a naked singularity forms\, in terms of both mass densities. Altho ugh there have been several investigations during the last decade about in homogeneous collapse models (e.g. Joshi\, Bicak)\, the reason that here we pursue the simplest possible Spherical Model is so that we can then proce ed to apply it to Non-spherical collapse by using the Price-Cunningham-Mon crief (1980) slow-rotation framework. This should provide a first indicati on of how inhomogeneity may lead to the formation of something different t o the Kerr Black Hole during a rotating collapse.\n\nhttps://events.ncbj.g ov.pl/event/152/contributions/911/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/911/ END:VEVENT BEGIN:VEVENT SUMMARY:Equatorial accretion on the Kerr black hole DTSTART;VALUE=DATE-TIME:20220921T124000Z DTEND;VALUE=DATE-TIME:20220921T130000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-910@events.ncbj.gov.pl DESCRIPTION:Speakers: Andrzej Odrzywolek ( IFT UJ )\nWe investigate statio nary accretion of the collisionless Vlasov gas onto the Kerr black hole\, occurring in the equatorial plane. At infinity the gas obeys the Maxwell-J uttner distribution\, restricted to the equatorial plane. In the vicinity of the black hole\, the motion of the gas is governed by the spacetime geo metry. We compute accretion rates of the rest-mass\, the energy\, and the angular momentum\, as well as the particle number surface density\, focusi ng on the dependence of these quantities on the asymptotic temperature of the gas and the black hole spin. The accretion slows down the rotation of the black hole.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/910/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/910/ END:VEVENT BEGIN:VEVENT SUMMARY:Critical relaxation in AdS/CFT DTSTART;VALUE=DATE-TIME:20220921T122000Z DTEND;VALUE=DATE-TIME:20220921T124000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-909@events.ncbj.gov.pl DESCRIPTION:Speakers: Mario Flory ( Jagiellonian University Krakow )\nIt i s not only known that hairy black holes can exist in asymptotically Anti-d e Sitter (AdS) spaces\, but also that in the context of the Anti-de Sitter /Conformal Field Theory (AdS/CFT) correspondence\, such black holes can be interpreted as holographic duals of superfluids. After a perturbation\, t hese black holes usually exhibit an exponentially damped ringing down desc ribed by quasi-normal modes\, however\, I will show that for perturbations around the exact critical point that characterizes the onset of the forma tion of scalar hair this relaxation will exhibit a power law behaviour at late times. I will also explain how this can be interpreted through the le ns of the AdS/CFT correspondence.\n\nhttps://events.ncbj.gov.pl/event/152/ contributions/909/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/909/ END:VEVENT BEGIN:VEVENT SUMMARY:Resonant enlargements of the Poincaré/AdS (super)algebras DTSTART;VALUE=DATE-TIME:20220921T120000Z DTEND;VALUE=DATE-TIME:20220921T122000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-908@events.ncbj.gov.pl DESCRIPTION:Speakers: Remigiusz Durka ( Institute of Theoretical Physics\, University of Wroclaw )\nUsing an efficient pattern-based computational m ethod of generating the so-called ‘resonating’ algebraic structures re sults in a wide class of the new Lie (super)algebras. They are enlargement s of the Poincaré and Anti-de-Sitter (super)algebras\, which inherit thei r base (anti)commutation structure. Obtained superalgebras are rooted in t he semigroup expansion method and Maxwell and Soroka-Soroka algebras\, spa nned by the Lorentz generator $J_ab$\, translations $P_{a}$ and additional Lorentz-like generator $Z_{ab}$. Considered configurations include cases up to two fermionic supercharges $Q^I_{alpha}$ and offer interesting modi fications to the gauge (super)gravity theories. Presentation is based on arxiv:2108.10304 and arxiv:2205.05921.\n\nhttps://events.ncbj.gov.pl/event /152/contributions/908/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/908/ END:VEVENT BEGIN:VEVENT SUMMARY:Quasinormal modes of extremal black holes DTSTART;VALUE=DATE-TIME:20220921T090000Z DTEND;VALUE=DATE-TIME:20220921T093000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-907@events.ncbj.gov.pl DESCRIPTION:Speakers: Filip Ficek ( Jagiellonian University )\nIn this sho rt talk I will discuss the explicitly-solvable toy-model for the problem o f waves propagating outside of an extremal black hole. After showing some results regarding quasinormal modes in such setup I will move to the more complicated case of an extremal Reissner-Nordström-anti-de Sitter black h ole. This is a joint work with Claude Warnick.\n\nhttps://events.ncbj.gov. pl/event/152/contributions/907/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/907/ END:VEVENT BEGIN:VEVENT SUMMARY:Evolving black hole with scalar field accretion DTSTART;VALUE=DATE-TIME:20220921T101000Z DTEND;VALUE=DATE-TIME:20220921T103000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-906@events.ncbj.gov.pl DESCRIPTION:Speakers: Marco de Cesare ( University of Naples "Federico I I" )\nI will present recent results on evolving black holes in general rel ativity. Approximate analytical solutions are obtained by expanding the Ei nstein field equations close to the trapping horizon for a dynamical spher ically symmetric black hole in the presence of a minimally coupled self-in teracting scalar field. This is made possible by a new parametrization of the metric\, in which the displacement from the horizon as well as its exp ansion rate feature explicitly. Our results are valid in a neighbourhood o f the horizon and hold for any scalar field potential and spacetime asympt otics. An exact equation for the accretion rate is also obtained\, which g eneralizes the standard Bondi formula. We also develop a dynamical system approach to study near-equilibrium black holes\; using this formalism\, we focus on a simple model to show that the near-equilibrium dynamics is cha racterized by simple scaling relations among dynamical variables. Moreover \, we show that solutions with purely ingoing energy-momentum flux never r each equilibrium. [based on arXiv:2205.01712]\n\nhttps://events.ncbj.gov.p l/event/152/contributions/906/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/906/ END:VEVENT BEGIN:VEVENT SUMMARY:Revisiting timelike geodesics in the Schwarzschild spacetime: gene ral expressions in terms of Weierstrass elliptic functions DTSTART;VALUE=DATE-TIME:20220921T095000Z DTEND;VALUE=DATE-TIME:20220921T101000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-905@events.ncbj.gov.pl DESCRIPTION:Speakers: Adam Cieślik ( Jagiellonian University )\nThe theor y of Schwarzschild timelike geodesics is revisited. Based on Weierstrass a nd Biermann's result\, a formula describing all non radial\, timelike traj ectories in terms of Weierstrass elliptic functions is derived. A single f ormula works for an entire geodesic trajectory\, even if it passes through turning points. Additionally\, with this formula's help\, expressions for the proper and coordinate time along the geodesic are derived.\n\nhttps:/ /events.ncbj.gov.pl/event/152/contributions/905/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/905/ END:VEVENT BEGIN:VEVENT SUMMARY:Hyperheavenly spaces and their application in para-Kähler geometr ies DTSTART;VALUE=DATE-TIME:20220921T093000Z DTEND;VALUE=DATE-TIME:20220921T095000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-904@events.ncbj.gov.pl DESCRIPTION:Speakers: Adam Chudecki ( Center of Mathematics and Physics\, Lodz University of Technology )\nThe talk is devoted to the neutral 4-dime nsional spaces. As a basic structure we consider weak\, expanding hyperhea venly space\, i.e.\, a space equipped with (at least one) integrable\, tot ally null\, 2-dimensional distribution which is not parallely propagated. It is assumed that this distribution is self-dual (SD). If a space is addi tionally equipped with two anti-self-dual (ASD)\, parallely propagated dis tributions\, it becomes para-Kähler space. The metric of such a space is analyzed. Some new examples of para-Kähler and Einstein metrics are prese nted.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/904/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/904/ END:VEVENT BEGIN:VEVENT SUMMARY:Conformal geodesics can not spiral DTSTART;VALUE=DATE-TIME:20220921T080000Z DTEND;VALUE=DATE-TIME:20220921T083000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-902@events.ncbj.gov.pl DESCRIPTION:Speakers: Maciej Dunajski ( University of Cambridge )\nWe show that conformal geodesics on a Riemannian manifold cannot spiral: there do es not exist a conformal geodesic which becomes trapped in every neighbour hood of a point. This settles an outstanding open problem in General Relat ivity posed by Friedrich. This is joint work with Peter Cameron and Paul T od.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/902/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/902/ END:VEVENT BEGIN:VEVENT SUMMARY:Coadjoint representation of the BMS group DTSTART;VALUE=DATE-TIME:20220921T070000Z DTEND;VALUE=DATE-TIME:20220921T080000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-901@events.ncbj.gov.pl DESCRIPTION:Speakers: Glenn Barnich ( Université libre de Bruxelles )\nTh e coadjoint representation of the BMS group is worked out from purely grou p theoretic considerations. It is then identified in the non-radiative gra vitational data at null infinity.\n\nhttps://events.ncbj.gov.pl/event/152/ contributions/901/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/901/ END:VEVENT BEGIN:VEVENT SUMMARY:POTOR meeting DTSTART;VALUE=DATE-TIME:20220921T153000Z DTEND;VALUE=DATE-TIME:20220921T173000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-900@events.ncbj.gov.pl DESCRIPTION:https://events.ncbj.gov.pl/event/152/contributions/900/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/900/ END:VEVENT BEGIN:VEVENT SUMMARY:Stability of differentially rotating compact objects against a pro mpt collapse DTSTART;VALUE=DATE-TIME:20220920T151000Z DTEND;VALUE=DATE-TIME:20220920T153000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-899@events.ncbj.gov.pl DESCRIPTION:Speakers: Paweł Szewczyk ( University of Warsaw\, Astronomica l Observatory )\nNumerical simulations have been an important method for s tudying complex astrophysical scenarios\, such as supernova explosions\, s howing that the remnant of core-collapse supernova rotates differentially at the initial phase of evolution. For neutron stars\, differential rotati on allows for significantly larger masses than rigid rotation. In our work \, we study the stability of those objects and look for the most massive s table neutron stars that can be produced in core-collapse supernova. I wil l present the results of our studies. For a polytropic equation of state\, we have estimated the limit of stability against radial oscillations for a selected sample of configurations. We considered a wide range of paramet ers and found stable configurations even twice as massive as the most mass ive non-rotating configuration.\n\nhttps://events.ncbj.gov.pl/event/152/co ntributions/899/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/899/ END:VEVENT BEGIN:VEVENT SUMMARY:Early evolution of fully convective stars in scalar-tensor gravity DTSTART;VALUE=DATE-TIME:20220920T143000Z DTEND;VALUE=DATE-TIME:20220920T145000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-897@events.ncbj.gov.pl DESCRIPTION:Speakers: Dèbora Aguiar Gomes ()\nhttps://events.ncbj.gov.p l/event/152/contributions/897/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/897/ END:VEVENT BEGIN:VEVENT SUMMARY:Observational properties of bosonic stars at the galactic centre DTSTART;VALUE=DATE-TIME:20220920T125000Z DTEND;VALUE=DATE-TIME:20220920T131000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-894@events.ncbj.gov.pl DESCRIPTION:Speakers: João Rosa ( University of Tartu )\nPushed by a numb er of advances\, electromagnetic observatories have now reached the horizo n scale of supermassive black holes. The existence and properties of horiz ons in our universe is one of the outstanding fundamental issues that can now be addressed. Here we investigate the ability to discriminate between black holes and compact\, horizonless objects\, focusing on the lensing of hot spots and accretion disks around compact objects. We work in particul ar with boson and Proca stars as central objects\, and show that the absen ce of a horizon gives rise to a characteristic feature -- photons that plo ugh through the central object and produce an extra image. This feature sh ould be universal for central objects made of matter weakly coupled to the standard model.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/894 / LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/894/ END:VEVENT BEGIN:VEVENT SUMMARY:Studying Post-merger Outflows from Magnetized Neutrino-cooled Accr etion Disk Simulations DTSTART;VALUE=DATE-TIME:20220920T123000Z DTEND;VALUE=DATE-TIME:20220920T125000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-893@events.ncbj.gov.pl DESCRIPTION:Speakers: Fatemeh Hossein-Nouri ( CFT PAN )\nNeutrino-cooled accretion flow around a spinning black hole\, produced by a compact binar y merger is a promising scenario for jet formation and launching magnetica lly and neutrino-driven outflows. Based on GW170817 gravitational wave det ection by LIGO and Virgo observatories followed by electromagnetic counter parts\, this model can explain the central engine of the short duration ga mma ray bursts (GRB) and kilonova radiations. Using the open-source GRMHD HARM_COOL code\, we evolved several 2D magnetized accretion disk-black hol e models with realistic equation of state in the fixed curved space-time b ackground. The disk and black hole’s initial parameters are chosen in a way to represent different possible post-merger scenarios of the merging c ompact objects. Our simulations show a strong correlation between black ho le’s spin and ejected mass. Generally\, mergers producing massive disks and rapidly spinning black holes launch more wind outflows. We applied par ticle tracer technique to measure the properties of the outflows\, and Sky net r-process nucleosynthesis code to measure the abundances for the eject ed matter. We observed our models generate winds with moderate velocity (v /c ~ 0.1-2.0)\, and broad range of electron fraction. We use these results to estimate the luminosity and light curves of possible radioactively pow ered transients emitted by such systems. We found the luminosity peaks wit hin the range of 10^40-10^41 erg/s which agrees with previous studies for disk wind outflows.\n\nhttps://events.ncbj.gov.pl/event/152/contributions/ 893/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/893/ END:VEVENT BEGIN:VEVENT SUMMARY:Event Horizon Telescope Imaging of Sagittarius A* and M87 black ho les in unpolarized and polarized light DTSTART;VALUE=DATE-TIME:20220920T093000Z DTEND;VALUE=DATE-TIME:20220920T103000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-892@events.ncbj.gov.pl DESCRIPTION:Speakers: Monika Moscibrodzka ( Radboud University )\nI will t alk about images of black holes in Saggittarius A* and M87 obtained with t he Event Horizon Telescope. Both images have a ring-like morphologies cons isstent with predictions of magnetohydrodynamical simulations of gas dynam ics in Kerr metric. EHT results provide new window for future tests of gra vitational physics and unique way to observe physics of accretion and jet formation around supermassive black holes.\n\nhttps://events.ncbj.gov.pl/e vent/152/contributions/892/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/892/ END:VEVENT BEGIN:VEVENT SUMMARY:The general relativistic two-body problem at 5PN DTSTART;VALUE=DATE-TIME:20220920T080000Z DTEND;VALUE=DATE-TIME:20220920T090000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-889@events.ncbj.gov.pl DESCRIPTION:Speakers: Gerhard Schaefer ( Friedrich Schiller University Jen a\, Institute of Theoretical Physics )\nThe talk will deliver insight into the general relativistic conservative binary dynamics through the fifth p ost-Newonian (5PN) order. Through the 4PN order\, the well established met hods and results get summarized. At the 5PN order\, a recently completed c omputation is presented including comparisons with the literature. Partial results through the 6PN order get reported.\n\nhttps://events.ncbj.gov.pl /event/152/contributions/889/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/889/ END:VEVENT BEGIN:VEVENT SUMMARY:CANCELLED! New perspectives onto the Universe in the era of multi- messenger astronomy DTSTART;VALUE=DATE-TIME:20220920T070000Z DTEND;VALUE=DATE-TIME:20220920T080000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-891@events.ncbj.gov.pl DESCRIPTION:Speakers: Samaya Nissanke ()\nhttps://events.ncbj.gov.pl/event /152/contributions/891/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/891/ END:VEVENT BEGIN:VEVENT SUMMARY:Canonical structure of f(T) and f(Q) gravity DTSTART;VALUE=DATE-TIME:20220919T124000Z DTEND;VALUE=DATE-TIME:20220919T131000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-882@events.ncbj.gov.pl DESCRIPTION:Speakers: Maria Jose Guzman ( University of Tartu )\nhttps:/ /events.ncbj.gov.pl/event/152/contributions/882/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/882/ END:VEVENT BEGIN:VEVENT SUMMARY:Lensing of gravitational waves in Palatini f(R) gravity DTSTART;VALUE=DATE-TIME:20220919T122000Z DTEND;VALUE=DATE-TIME:20220919T124000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-881@events.ncbj.gov.pl DESCRIPTION:Speakers: Sreekanth Harikumar (NCBJ)\nhttps://events.ncbj.gov. pl/event/152/contributions/881/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/881/ END:VEVENT BEGIN:VEVENT SUMMARY:Searches for Gravitational Waves from Known Pulsars at Two Harmoni cs in the Second and Third LIGO-Virgo Observing Runs DTSTART;VALUE=DATE-TIME:20220919T101000Z DTEND;VALUE=DATE-TIME:20220919T103000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-879@events.ncbj.gov.pl DESCRIPTION:Speakers: Paritosh Verma (NCBJ)\nI shall present the results o f the recent LIGO-Virgo-KAGRA paper on the targeted search from 236 pulsar s. When the angular momentum of the pulsar is not perfectly aligned with i ts symmetry axis\, the gravitational wave (GW) signal can originate at bot h once and twice the spin frequency of the pulsar due to the time-varying quadrupole moment. There has also been a quest to search for the dipole ra diation at once the spin frequency predicted by Brans- Dicke (BD) theory. The methods implemented to search for the signals are Bayesian analysis\, 5n-vector method and F/G/D-statistics.\n\nhttps://events.ncbj.gov.pl/event /152/contributions/879/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/879/ END:VEVENT BEGIN:VEVENT SUMMARY:Strong lensing of gravitational waves - new opportunity of multime ssenger astronomy DTSTART;VALUE=DATE-TIME:20220919T080000Z DTEND;VALUE=DATE-TIME:20220919T083000Z DTSTAMP;VALUE=DATE-TIME:20260305T090523Z UID:indico-contribution-152-875@events.ncbj.gov.pl DESCRIPTION:Speakers: Marek Biesiada ( National Centre for Nuclear Researc h )\nWe have entered the era of gravitational wave (GW) astronomy with rou tine detections of GW signals by LIGO-Virgo-KAGRA interferometric detector s. Future perspectives are bright with new generations of GW detectors: Ea rth based - Einstein Telescope and Cosmic Explorer or space borne - LISA\, DECIGO\, BBO. Gravitaional waves traveling along null geodesics can under go strong gravitational lensing like the electromagnetic waves do. Hence\, strong lensing of GW is becoming a popular research topic. In my talk I w ill review the state of the art in this subject\, including contributions of our group. I will also present new opportunities opening for the multim essenger astronomy from detections of lensed GW signals.\n\nhttps://events .ncbj.gov.pl/event/152/contributions/875/ LOCATION:Banach Center IMPAN 321 URL:https://events.ncbj.gov.pl/event/152/contributions/875/ END:VEVENT END:VCALENDAR