@article{5f2e85d6e8dd46b598eac699389a7d57,
title = "Negative power spectra in quantum field theory",
abstract = "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.",
keywords = "Anticorrelations, Correlations, Fluctuation power spectrum, Negative power, Stress tensor fluctuations, Wiener-Khinchin theorem",
author = "Hsiang, {Jen Tsung} and Wu, {Chun Hsien} and Ford, {L. H.}",
note = "Funding Information: We would like to thank Shun-Pei Miao, Kin-Wang Ng, Richard Woodard, and the participants of the 14th and 15th Peyresq workshops for valuable discussions. This work was supported in part by National Science Foundation Grant PHY-0855360 and by Grant NSC99-2112-M-031-002-MY3 . ",
year = "2011",
month = jun,
day = "13",
doi = "10.1016/j.physleta.2011.04.052",
language = "???core.languages.en_GB???",
volume = "375",
pages = "2296--2299",
journal = "Physics Letters, Section A: General, Atomic and Solid State Physics",
issn = "0375-9601",
number = "24",
}