半经典近似在预热初期的破裂
Breakdown of the semiclassical approximation during the early stages of preheating
摘要：
半经典近似的有效性进行了研究，在预热阶段的混沌膨胀模型使用修改以前提出的半经典引力的标准。如果修改后的标准被违反，那么量子场的两点函数的波动是大的，半经典近似是无效的。提供的证据表明，半经典近似打破了预热的早期阶段，以及之前的散射效应或逆反应效应是重要的。
英文摘要：
The validity of the semiclassical approximation is investigated during the preheating phase in models of chaotic inflation using a modification of a criterion previously proposed for semiclassical gravity. If the modified criterion is violated then fluctuations of the two-point function for the quantum fields are large and the semiclassical approximation is not valid. Evidence is provided that the semiclassical approximation breaks down during the early stages of preheating, well before either scattering effects or backreaction effects are important.
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