延迟再加热与相干振荡的破裂
Delayed Reheating and the Breakdown of Coherent Oscillations
摘要：
我们分析了暴胀结束后暴胀子场和度规中扰动的演化。我们提出了精确的解析近似的扰动，表明相干振荡的后暴胀凝聚必然打破之前，任何目前的现象学约束要求宇宙成为辐射为主。此外，崩溃发生在长度尺度上，相当于共同运动的后暴胀视界的大小。这项工作对暴胀“匹配”问题和后暴胀宇宙中可能产生的随机引力波背景都有意义。
英文摘要：
We analyze the evolution of the perturbations in the inflaton field and metric following the end of inflation. We present accurate analytic approximations for the perturbations, showing that the coherent oscillations of the post-inflationary condensate necessarily break down long before any current phenomenological constraints require the universe to become radiation dominated. Further, the breakdown occurs on length-scales equivalent to the comoving post-inflationary horizon size. This work has implications for both the inflationary "matching" problem, and the possible generation of a stochastic gravitational wave background in the post-inflationary universe.
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