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QFT approach to dressed particle processes in preheating and non-perturbative mechanism in kinematically-forbidden regime

Hidetoshi TayaYusuke Yamada
Jul 2022
摘要
We provide a quantum-field theoretic formulation of dressed particle dynamicsthat systematically include particle production and scattering/decay processesin the preheating era. Our approach is based on the so-called perturbationtheory in the Furry picture, in which coherent background fields (i.e.,inflaton and the expanding Universe) are treated non-perturbatively whereasinteractions between dressed particles are taken into account perturbatively.As application, we consider the instant preheating mechanism and compute thenumber of produced particles explicitly, assuming that the coherent fields areadiabatic. We find a novel non-perturbative particle-production mechanism,which is kinematically forbidden within the conventional perturbativecalculation and produces particles exponentially efficiently than theperturbative one does.
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