Gravitational Portals with Non-Minimal Couplings
Abstract
We consider the effects of non-minimal couplings to curvature of the form S S2 R, for three types of scalars: the Higgs boson, the inflaton, and a scalar dark matter candidate. We compute the abundance of dark matter produced by these non-minimal couplings to gravity and compare to similar results with minimal couplings. We also compute the contribution to the radiation bath during reheating. The main effect is a potential augmentation of the maximum temperature during reheating. A model independent limit of O(1012) GeV is obtained. For couplings S O(1), these dominate over minimal gravitational interactions.
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