Particle Seminar

Monday, January 20, 2020

Speaker: Takashi Toma

Affiliation: McGill

Time: 2:30PM -- 3:30PM

Location: HP 4351

Title: Relativistic treatment of dark thermalization

If dark sector is decoupled from the Standard Model sector due to feeble

couplings, these two sectors may separately be thermalized with
different temperatures. In this case, the Maxwell-Boltzmann distribution
is traditionally assumed for dark sector for simplicity regardless of
the temperature. In this talk, the full Bose-Einstein distribution is
considered in the simplest model of real scalar dark matter. We find
that the resultant reaction rates are enhanced compared to the rates
with the Maxwell-Boltzmann distribution at high temperature. Our result
affects on calculations of relic abundance of dark matter at
relativistic regime. We also consider applications of our formalism to
the freeze-in mechanism.