Dark Matter Freeze-in During Warm Inflation

  • Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars

October 22, 2024 2:00 PM - October 22, 2024 3:00 PM
PAIS 3205

Host:
Rouzbeh Allahverdi
Presenter:
Dr. Barmak Shams Es Haghi (UT Austin)
In this talk, I will present a novel perspective on the role of inflation in the production of Dark Matter (DM). Specifically, I will explore the DM production during Warm Inflation via ultraviolet Freeze-In (WIFI). After a brief review of DM production from a thermal bath, I will discuss the possibility of having a radiation bath during the inflationary phase; the so-called Warm Inflation (WI). Then I will demonstrate that in a WI setting the persistent thermal bath, sustained by the dissipative interactions with the inflaton field, can source a sizable DM abundance via the non-renormalizable interactions that connect the DM with the bath. Compared to the (conventional) radiation-dominated UV freeze-in scenario for the same reheating temperature, the resulting DM yield in WIFI is always enhanced, showing a strongly positive dependence on the mass dimension of the non-renormalizable operator. As I will show,  for a sufficiently large mass dimension of the operator, the entirety of the DM abundance of the Universe can be created during the inflationary phase.

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