量子场论中的负功率谱
Negative Power Spectra in Quantum Field Theory
摘要：
我们考虑了与场论中二次算符涨落有关的空间功率谱，如量子应力张量分量。我们表明，功率谱可以是负的，在大多数波动现象的维纳-欣钦定理需要一个积极的功率谱。我们展示了为什么通常的论点，积极的失败，在这种情况下，并讨论负功率谱的物理解释。可能的应用宇宙学进行了讨论。
英文摘要：
We consider the spatial power spectra associated with fluctuations of quadratic operators in field theory, such as quantum stress tensor components. We show that the power spectrum can be negative, in contrast to most fluctuation phenomena where the Wiener-Khinchine theorem requires a positive power spectrum. We show why the usual argument for positivity fails in this case, and discuss the physical interpretation of negative power spectra. Possible applications to cosmology are discussed.
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