Negative power spectra in quantum field theory

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• 作者：Jen-Tsung Hsiang^a ; ^{cosmology@gmail.com"" rel=""nofollow} ; Chun-Hsien Wu^b ; ^{chunwu@scu.edu.tw"" rel=""nofollow} ; L.H. Ford^c ; ^{ford@cosmos.phy.tufts.edu"" rel=""nofollow}
• 关键词：Fluctuation power spectrum ; Wiener– ; Khinchin theorem ; Stress tensor fluctuations ; Negative power ; Correlations ; Anticorrelations
• 刊名：Physics Letters A
• 出版年：2011
• 出版时间：13 June 2011
• 年：2011
• 卷：375
• 期：24
• 页码：2296-2299
• 全文大小：169 K

文摘

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–Khinchin 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.