[Seminar] Dr. Shuntaro Aoki (CAU) : Reheating and Dark Matter Freeze-in in the Higgs-$R^2$ Inflation Model

Asia/Seoul
Room 327 (물리학과 회의실) (Science Hall (322) )

Room 327 (물리학과 회의실)

Science Hall (322)

Description

Date : May 2nd (Mon) 1 PM - 5 PM

Venue : Science Hall Room 327

    • 13:00 17:00
      Reheating and Dark Matter Freeze-in in the Higgs-R2 Inflation Model 4h

      Abstract : The Higgs inflation perfectly agrees with the CMB observation, but suffers from a unitarity problem due to a large non-minimal coupling of Higgs field to the Ricci scalar. Recently, it has been shown that introducing a Ricci square term (R2 term) in the Higgs inflation can solve this problem.
      In this talk, we discuss the post-inflationary dynamics for reheating and freeze-in dark matter in the Higgs-R2 model. Taking the perturbative approach for reheating, we determine the evolution of the temperature for radiation bath produced during inflation and determine the maximum and reheating temperatures of the Universe. Also, adopting a singlet scalar dark matter, we discuss the freeze-in production of dark matter both from the non-thermal scattering during reheating and the thermal scattering after reheating.

      Speaker: Dr Shuntaro Aoki (Chung-Ang University)