BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Marek Biesiada (NCBJ)\, Strong lensing in the LSST: new opportunit ies for cosmology and fundamental physics DTSTART;VALUE=DATE-TIME:20241024T131500Z DTEND;VALUE=DATE-TIME:20241024T133000Z DTSTAMP;VALUE=DATE-TIME:20260813T154125Z UID:indico-contribution-271-1747@events.ncbj.gov.pl DESCRIPTION:Strong gravitational lensing is one of the basic predictions o f General Relativity. By now it has become a mature research field and bro ught many important results in extrgalactic astronomy and cosmology. Howev er\, the potential in this field is much bigger and not sufficiently explo red yet. I will review some yet unexplored topics in which strong lensing systems discovered by the LSST may bring a breakthrough\, in particular fo cusing on the experience of LSST Poland team.\n\nhttps://events.ncbj.gov.p l/event/364/contributions/1747/ LOCATION: URL:https://events.ncbj.gov.pl/event/364/contributions/1747/ END:VEVENT BEGIN:VEVENT SUMMARY:Suhani Gupta (CFT)\, Bending the web: exploring the impact of modi fied gravity on the density field and halo properties within the cosmic we b DTSTART;VALUE=DATE-TIME:20241024T130000Z DTEND;VALUE=DATE-TIME:20241024T131500Z DTSTAMP;VALUE=DATE-TIME:20260813T154125Z UID:indico-contribution-271-1746@events.ncbj.gov.pl DESCRIPTION:Dependence of the properties of galaxies and dark matter halos on the hosting environment is one of the central issues in cosmology. Als o\, owing to the large-scale cosmological data from present and future sur veys\, it is of paramount importance to model non-linear measures associat ed with both underlying dark matter density fields\, and halos which can h elp forecast various large-scale structure properties. In this work\, we s tudy the relative importance of different cosmic web (CW) environments in influencing the dark matter density and halo properties in two modified gr avity (MG) models: namely Hu-Sawicki f(R) gravity model\, and normal branc h of Dvali-Gabadadze-Porrati (nDGP) gravity model. Both these models exhib it an enhanced structure formation scenario w.r.t. standard CDM case\, at different cosmic scales and epochs. This is a result of an additional fift h force in these models\, which acts on top of the Newtonian gravitational force on the cosmological scales. The effect of the fifth-force is reflec ted in large-scale cosmic density fields\, and in the halo properties. We study the hierarchical clustering properties of dark matter in different C W environments in these MG models. The clustering statistics in each envir onment exhibit a different trend from the overall density. Similarly\, eac h environment in MG models has a distinct departure from CDM\, and MG sign atures persist over a range of length scales and epochs. The difference of higher-order dark matter clustering statistics in these MG models w.r.t. CDM\, and its dependence on the environment shows that the reduced cumulan ts can be used as cosmological probes of these beyond-GR models. We also f ocus on the halo properties\, such as the halo mass function\, halo spin a nd alignment\, and how the change in MG results is influenced in each CW e nvironment. The formation and evolution of DM halos\, which are sites of g alaxy formation\, is also influenced by the underlying theory of gravity\, and we show that the change in halo properties w.r.t. standard CDM is imp acted by the hosting CW environment. Such environmental dependence in the change of dark matter and halo properties in MG scenarios will play an imp ortant role in future cosmological and galaxy formation studies\, and for disentangling MG effects from the environmental impact in these large-scal e structure properties.\n\nhttps://events.ncbj.gov.pl/event/364/contributi ons/1746/ LOCATION: URL:https://events.ncbj.gov.pl/event/364/contributions/1746/ END:VEVENT BEGIN:VEVENT SUMMARY:Shuaibo Geng (NCBJ)\, Investigating the redshift Evolution of Lens ing Galaxy Density Slopes via Model-Independent Distance Ratios in the Era of LSST DTSTART;VALUE=DATE-TIME:20241024T133000Z DTEND;VALUE=DATE-TIME:20241024T134500Z DTSTAMP;VALUE=DATE-TIME:20260813T154125Z UID:indico-contribution-271-1748@events.ncbj.gov.pl DESCRIPTION:Strong lensing systems\, soon to be widely detected by LSST\, serve as powerful tools for exploring cosmology and galaxy structure. Com- bined with stellar kinematics\, the Einstein radius measures the lens’s total projected mass and helps constrain lens mass profiles. However\, it s observed angular size also varies with the cosmological model\, specific ally through the distance ratio D_ls/D_s\, entangling cosmology with galax y structure. Addressing this\, our study uses 161 strong lensing systems t o evaluate the power-law (PL) mass distribution slope and its redshift evo lution without relying on a specific cosmological model. We employ non-par ametric regression via Artificial Neural Networks and Gaussian Processes o n data from cosmic chronometers and Type Ia supernovae to reconstruct dist ance ratios. Our analysis differentiates between the total mass and lumino us matter density slopes\, revealing that the total mass concentration inc reases towards the present. While we observe only marginal increases in th e density slope of luminous matter as redshift decreasing. The study provi des a basis for using strong lensing to constrain cosmological parameters and to understand galaxy evolution\, with ongoing potential applications b eing investigated.\n\nhttps://events.ncbj.gov.pl/event/364/contributions/1 748/ LOCATION: URL:https://events.ncbj.gov.pl/event/364/contributions/1748/ END:VEVENT END:VCALENDAR