Abstract
We provide a quantum-field theoretic formulation of dressed particle dynamics that systematically includes particle production and scattering/decay processes in the preheating era. Our approach is based on the so-called perturbation theory in the Furry picture, in which coherent background fields (i.e., inflaton and the expanding Universe) are treated non-perturbatively whereas interactions between dressed particles are taken into account perturbatively. As an application, we consider the instant preheating mechanism and compute the number of produced particles explicitly. We find a novel non-perturbative particle-production mechanism, which is kinematically forbidden within the conventional perturbative calculation and gives the dominant contribution in certain parameter regimes, e.g., light daughter particles.
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Taya, H., Yamada, Y. QFT approach to dressed particle processes in preheating and non-perturbative mechanism in kinematically-forbidden regime. J. High Energ. Phys. 2023, 48 (2023). https://doi.org/10.1007/JHEP02(2023)048
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DOI: https://doi.org/10.1007/JHEP02(2023)048