Speaker
Minxi He
(RESCEU, UTokyo)
Description
We consider the inflation and preheating process in a two-field model which consists of the R^2 term in the Starobinsky model and standard model Higgs field with non-minimal coupling. The inflation dynamics is found to be effectively single-filed like with large non-minimal coupling. The (p)reheating process presents different properties from those in single-field models. The violent behavior and the cutoff scale problem in the Higgs inflation are resolved by the R^2 term. More precisely, the cutoff scale is pushed up to Planck scale and the spiky effective mass found in the single-field Higgs inflation gets milder.
