宇宙学粒子产生：涨落和系综图像
Cosmological particle creation: Fluctuations and an ensemble picture
摘要：
我们指出，在依赖于时间的经典背景下的量子场的背景下，与一个给定的动量产生的粒子的数量在很大程度上偏离其平均值。由于相应的傅里叶模是非定域的，这种偏差表明，数算符的期望值只能在时空系综中才有意义。使用一个完整的局域化波包正交族，我们展示了如何在局域条件下对宇宙粒子的产生给出系综解释。根据这一结构，重新研究了充气后的再加热过程。
英文摘要：
We point out that in the context of quantum fields in time dependent classical backgrounds, the number of created particles with a given momentum largely deviates about its mean value. Since the corresponding Fourier modes are nonlocal, this deviation shows that the expectation value of the number operator can only make sense in an ensemble of spacetimes. Using a complete orthonormal family of localized wave packets, we show how an ensemble interpretation can be given to cosmological particle creation in local terms. The reheating process following inflation is reexamined in the light of this construction.
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