There are no scheduled talks today.
No Galaxy Coffee
GC retreat
Thu, 30 Sep 2021, 11:00
Sü Suri
Fri, 1 Oct 2021, 15:00
Corentin Cadiou
Thu, 7 Oct 2021, 11:00

Freeze-in versus Glaciation: freezing into a thermalized hidden sector (PLEASE NOTE UNUSUAL TIME)

Nicolas Fernandez , University of Illinois
The standard freeze-in paradigm has a hidden UV sensitivity in that the initial DM population is assumed to be exactly zero. We explore how a pre-existing population of DM, either alone or as part of a thermalized dark sector, affects the dynamics of freeze-in. The UV sensitivity of this more general scenario, which we dub “glaciation”, is manifested in the dependence of the late-time relic abundance on the size of the initial population. We dispense rather quickly with the case of a stand-alone initial DM abundance, which simply leads to an offset in the relic abundance compared to the standard scenario, but we find rich and interesting dynamics in the case of a pre-existing thermalized dark sector. Our results have important consequences for direct detection experiments searching for freeze-in dark matter.
Particle Phenomenology
29 Jul 2021, 17:00
Institut für Theoretische Physik, Online

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