标题： 混沌暴胀预热阶段的半经典近似的有效性 显示英文标题

标题： Validity of the semiclassical approximation during the preheating phase of chaotic inflation

摘要： 半经典的近似方法经常被用来描述粒子产生的初始阶段，这一阶段通常被称为预加热，它发生在混沌暴胀模型中的暴胀时期之后。 在此阶段，由产生的粒子对暴胀子场的反作用效应显著，尽管如果暴胀子场与大量的量子场耦合时允许存在大的反作用效应，人们可能仍然会担心这种半经典近似的有效性。本文提出了在这种情况下判断半经典近似有效性的标准，并探讨了该标准在预加热期间是否成立的问题。 显示英文摘要

摘要： The semiclassical approximation has frequently been used to describe the initial stage of particle production, often called preheating, which occurs after the inflationary epoch in chaotic models of inflation. During this phase backreaction effects from the produced particles on the inflaton field are significant, and one might be concerned about the validity of the semiclassical approximation, even though large backreaction effects are allowed if the inflaton field is coupled to a large number of quantum fields. A criterion is presented for the validity of the semiclassical approximation in this case and the question of whether this criterion is satisfied during preheating is addressed.