General relativistic preheating after inflation
Abstract
We show that general relativistic effects are crucial in the preheating era that follows inflation. The efficiency of explosive particle production during preheating is enhanced when the fully coupled system of metric and quantum field fluctuations is considered. Metric perturbations are resonantly amplified and stimulate scalar field resonances via gravitational rescattering. The metric perturbations also lead to a change in the shape of the effective potential, breaking any discrete symmetries, and hence alter the nature of nonthermal symmetry restoration and defect production after inflation. The enhanced metric perturbations could also affect the acoustic Doppler peaks in the CMB usually predicted by inflation, and could lead to an increased signal of gravitational waves, which improves the possibility of their detection by LIGO.Keywords
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