Nonthermal Phase Transitions after Inflation
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TL;DR
It is shown that quantumuctuation sof scalar and vector vectors produced at this stage of reheating are much greater than they would be in a state ofthermal equilibrium.
Abstract
At the first stage of reheating after inflation, parametric resonance may rapidly transfer most of the energy of an inflaton field $\phi$ to the energy of other bosons. We show that quantum fluctuations of scalar and vector fields produced at this stage are much greater than they would be in a state of thermal equilibrium. This leads to cosmological phase transitions of a new type, which may result in a copious production of topological defects and in a secondary stage of inflation after reheating.