Speaker
Dr
Shuntaro Aoki
Description
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. Analyzing the temperature evolution of the Universe carefully, we evaluate the abundance of dark matter produced both from the non-thermal scattering during reheating and the thermal scattering after reheating. An application to leptogenesis scenario will also be discussed.
