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SUMMARY:Seesaw Cosmology
DTSTART:20261105T050000Z
DTEND:20261105T060000Z
DTSTAMP:20261113T143000Z
UID:indico-event-19127@indico.global
DESCRIPTION:Speakers: Nicolás Bernal (New York University Abu Dhabi)\n\nW
 e study perturbative reheating in which the inflaton transfers its energy 
 to the Standard Model through right-handed neutrinos (RHNs) responsible fo
 r light-neutrino masses via the type-I seesaw mechanism. We refer to the r
 esulting nonstandard thermal history as seesawcosmology. When produced rel
 ativistically and sufficiently long lived\, the RHNs generate a characteri
 stic sequence of inflaton\, relativistic-RHN\, nonrelativistic-RHN\, and S
 tandard Model radiation domination. We solve the Boltzmann system while re
 taining the production-time dependence of the nonthermal RHN distribution 
 and its relativistic-to-nonrelativistic transition. The Standard Model tem
 perature rapidly approaches a plateau during inflaton domination and subse
 quently scales as a^-1/4 and a^-3/8 during relativistic- and nonrelativist
 ic-RHN domination\, respectively. We investigate the implications of seesa
 w cosmology for dark-matter production. Direct production through inflaton
  decays can be enhanced relative to conventional reheating by a factor of 
 order mϕ/(2mN)\, while ultraviolet freeze-in exhibits the critical temper
 ature powers p=12 and 20\, leading to potentially large contributions befo
 re the final radiation-dominated era. Seesaw cosmology therefore connects 
 neutrino-mass generation\, the pre-BBN thermal history and phenomena such 
 as dark-matter production and baryogenesis.\n\nhttps://indico.global/event
 /19127/
URL:https://indico.global/event/19127/
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