2013-10-21

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Speaker: Yuki Watanabe

Title: Gravitational modulated reheating after inflation.

Abstract: We study inflationary models of multiple scalar fields with a non-trivial field metric and a non-minimal coupling between gravity and the inflaton sector. 
In this class of models we show that the inflaton fields can decay into other fermions and bosons -- thereby reheating the Universe gravitationally -- even if the inflaton sector is not directly coupled to these other fields. Since all masses of the standard model particles are acquired from the Higgs field vacuum expectation value, we argue that the rate of gravitational particle production can be spatially modulated by the stochastic Higgs condensate during inflation.
We show the observational constraints on the curvature perturbations generated from this Higgs isocurvature mode.