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SUMMARY:Cosmological gravitational particle production and implications fo
 r dark matter phenomenology
DTSTART:20261016T140000Z
DTEND:20261016T150000Z
DTSTAMP:20261013T010000Z
UID:indico-event-1593@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Duarte Feiteira (U. Helsinki)\n\nParticle production
  in the Early Universe is one of the cornerstones of modern cosmology and 
 plays an important role in dark matter phenomenology. In this talk\, I wil
 l first discuss the gravitational production of scalars during inflation. 
 I will compare Bogolyubov coefficient and Starobinsky stochastic approache
 s\, showing that they only agree in the limit of infinitely long inflation
 . High-scale inflation is very efficient in particle production\, leading 
 to constraints on the existence of free\, light\, and stable scalars: such
  particles are viable only if their masses are below the eV scale or if th
 e reheating temperature is in the GeV range. These constraints motivate sc
 enarios in which dark matter is produced via low-temperature freeze-in. In
  this framework\, I will consider warm Higgs portal dark matter. In scenar
 ios where the Standard Model thermal bath never reached high temperatures\
 , dark matter production can be suppressed. This allows for a significant 
 dark matter-Higgs coupling\, enabling warm dark matter detection via Higgs
  decay at colliders. I will further discuss the strong Lyman-α bound on t
 he dark matter mass\, excluding masses below 50-100 keV\, and show how the
  shape of the warm dark matter momentum distribution is highly non-thermal
  and not captured by the commonly used αβγ-parametrization.\n\nhttps://
 conference.ippp.dur.ac.uk/event/1593/
URL:https://conference.ippp.dur.ac.uk/event/1593/
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