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SUMMARY:Nicolás Bernal (Antonio Narino University)
DTSTART:20200507T220000Z
DTEND:20200507T230000Z
DTSTAMP:20260423T020952Z
UID:CosmoConB/7
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CosmoConB/7/
 ">Boosting Ultraviolet Freeze-in</a>\nby Nicolás Bernal (Antonio Narino U
 niversity) as part of CosmoConβ - Cosmology from Home\n\n\nAbstract\nWe p
 resent a novel UV freeze-in mechanism for enhancing the dark matter abunda
 nce in cosmologies where inflation is followed by an epoch dominated by a 
 fluid stiffer than radiation. In such scenarios\, even a small radiation a
 bundance\, produced for instance by instantaneous preheating effects\, wil
 l eventually dominate the total energy density of the Universe without the
  need for a complete inflaton decay. For the sake of concreteness\, we foc
 us in non-oscillatory (NO) quintessential inflation models\, albeit our tr
 eatment is rather general and can be extended to other scenarios. The high
  temperature of the initial thermal bath together with the absence of subs
 equent entropy injections into the Standard Model plasma translates into a
  highly-effective UV DM freeze-in. In particular\, we find that\, during k
 ination\, an enhancement in the DM abundance is generically obtained for a
 ny production cross-section not-decreasing with temperature.\n\nVideo of T
 alk: <a href="https://www.youtube.com/watch?v=j0M36IY36E0">https://www.you
 tube.com/watch?v=j0M36IY36E0</a>\n\nRelevant Papers:<br>\n<a href="https:/
 /arxiv.org/abs/2004.13706">[2004.13706] Boosting Ultraviolet Freeze-in in 
 NO Models</a>\, by Nicolás Bernal\, Javier Rubio\, Hardi Veermäe<br>\n<a
  href="https://arxiv.org/abs/1909.07992">[1909.07992] Ultraviolet Freeze-i
 n and Non-Standard Cosmologies</a>\, by Nicolás Bernal\, Fatemeh Elahi\, 
 Carlos Maldonado\, James Unwin<br>\n<a href="https://arxiv.org/abs/1803.01
 866">[1803.01866] Spin-2 Portal Dark Matter</a>\, by Nicolas Bernal\, Mair
 a Dutra\, Yann Mambrini\, Keith A. Olive\, Marco Peloso\, Mathias Pierre<b
 r>\n
LOCATION:https://researchseminars.org/talk/CosmoConB/7/
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