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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:20260414T155255Z
UID:indico-contribution-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/
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