论文标题
QFT方法在运动学方面的预热和非扰动机制中的穿着粒子过程
QFT approach to dressed particle processes in preheating and non-perturbative mechanism in kinematically-forbidden regime
论文作者
论文摘要
我们提供了穿着的粒子动力学的量子场理论公式，该公式系统地包括预热时代的粒子产生和散射/衰减过程。我们的方法基于毛茸茸的图片中所谓的扰动理论，在毛茸茸的图片中，连贯的背景字段（即膨胀的宇宙和扩展的宇宙）受到非扰动处理，而穿着颗粒之间的相互作用则被视为扰动。作为应用，我们考虑了即时预热的机制，并明确计算了产生的颗粒的数量，假设相干磁场是绝热的。我们发现了一种新型的非扰动颗粒产生机制，该机制在传统扰动计算中是在运动学上禁止的，并且比扰动性的粒子高效地产生颗粒。
We provide a quantum-field theoretic formulation of dressed particle dynamics that systematically include 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 application, we consider the instant preheating mechanism and compute the number of produced particles explicitly, assuming that the coherent fields are adiabatic. We find a novel non-perturbative particle-production mechanism, which is kinematically forbidden within the conventional perturbative calculation and produces particles exponentially efficiently than the perturbative one does.
