期刊
PHYSICS LETTERS B
卷 596, 期 3-4, 页码 306-310出版社
ELSEVIER
DOI: 10.1016/j.physletb.2004.06.090
关键词
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Modifications to the primordial power spectrum of inflationary density perturbations have been studied recently using a boundary effective field theory approach. In the approximation of a fluctuating quantum field on a fixed background, the generic effect of new physics is encoded in parameters of order HIM. Here, we point out that the back-reaction on the metric can be neglected only when these parameters obey certain bounds that may put them beyond the reach of observation. (C) 2004 Elsevier B.V. All rights reserved.
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