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SUMMARY:HiDDeN webinar: Cosmology without scalars: Inflation\, reheating\,
  and baryogenesis in a superfluorescent Universe
DTSTART;VALUE=DATE-TIME:20231205T150000Z
DTEND;VALUE=DATE-TIME:20231205T160000Z
DTSTAMP;VALUE=DATE-TIME:20260419T145311Z
UID:indico-event-7355@indico.ific.uv.es
DESCRIPTION:Based on the Markovian master equation for a localized system 
 embedded in de Sitter (dS) space\, we find that the dS vacuum acts as a th
 ermal bath at the Gibbons-Hawking temperature h / 2 \\pi\, where h is the 
 Hubble parameter.  An observer in the "cosmic rest frame" measures a back
 ground energy density proportional to h^4 (Stefan-Boltzmann law).  By ext
 ending this result adiabatically to non-constant h and including the bath'
 s contribution in the Friedmann equations\, we arrive at a picture of the 
 irreversible relaxation of the cosmological constant (h -> 0) and a gracef
 ul exit to inflation.  Thermal particle production during inflation gives
  adiabatic\, Gaussian\, and approximately scale-invariant cosmological per
 turbations.  No separate reheating phase is needed and the observed matte
 r-antimatter asymmetry can be obtained with fewer parameters than in previ
 ous models of gravitational baryogenesis.  This offers a simple and viabl
 e cosmology for the very early Universe without requiring any scalar field
 s\, not even an inflaton. \n\nhttps://indico.ific.uv.es/event/7355/
LOCATION:& broadcasted from IFIC seminar room online
URL:https://indico.ific.uv.es/event/7355/
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