Negative Power Spectra in Quantum Field Theory
Quantum Physics
2015-05-20 v1 General Relativity and Quantum Cosmology
High Energy Physics - 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-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.
Keywords
Cite
@article{arxiv.1012.3226,
title = {Negative Power Spectra in Quantum Field Theory},
author = {Jen-Tsung Hsiang and Chun-Hsien Wu and L. H. Ford},
journal= {arXiv preprint arXiv:1012.3226},
year = {2015}
}
Comments
4 pages, 1 figure