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arXiv 1305.3755gr-qc
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非高斯随机引力

Non-Gaussian Stochastic Gravity

Jason D. Bates

摘要:

本文提出了一种新的非高斯随机引力公式,它以一种自洽的方式引入了自由量子标量场的量子应力能量张量涨落的高阶矩。一个计划的开发获得实现这些波动的Wightman函数,和波动的行为进行了研究。由此产生的概率分布的能量密度的波动在闵可夫斯基时空中被发现是类似于一个移动的伽玛分布。该分布的特征在于在小的负值处的最小能量密度截止,但是在该截止附近的尖峰使得观察到负值的总概率大约为62%,由相应的更大但更罕见的正值平衡。

英文摘要:

This paper presents a new, non-Gaussian formulation of stochastic gravity by incorporating the higher moments of the fluctuations of the quantum stress energy tensor for a free quantum scalar field in a consistent way. A scheme is developed for obtaining realizations of these fluctuations in terms of the Wightman function, and the behavior of the fluctuations is investigated. The resulting probability distribution for fluctuations of the energy density in Minkowski spacetime is found to be similar to a shifted Gamma distribution. This distribution features a minimum energy density cutoff at a small negative value, but a sharp peak in the vicinity of this cutoff such that the total probability of observing a negative value is approximately 62%, balanced by correspondingly larger but rarer positive values.

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