@Article{Agullo_etal2010,
author="Agullo, I.
and Navarro-Salas, J.
and Olmo, G. J.
and Parker, L.",
title="Revising the observable consequences of slow-roll inflation",
journal="Physical Review D",
year="2010",
publisher="Amer Physical Soc",
volume="81",
number="4",
pages="043514--14pp",
abstract="We study the generation of primordial perturbations in a (single-field) slow-roll inflationary Universe. In momentum space, these (Gaussian) perturbations are characterized by a zero mean and a nonzero variance Delta(2) (k, t). However, in position space the variance diverges in the ultraviolet. The requirement of a finite variance in position space forces one to regularize Delta(2) (k, t). This can (and should) be achieved by proper renormalization in an expanding Universe in a unique way. This affects the predicted scalar and tensorial power spectra (evaluated when the modes acquire classical properties) for wavelengths that today are at observable scales. As a consequence, the imprint of slow-roll inflation on the cosmic microwave background anisotropies is significantly altered. We find a nontrivial change in the consistency condition that relates the tensor-to-scalar ratio r to the spectral indices. For instance, an exact scale-invariant tensorial power spectrum, n(t) = 0, is now compatible with a nonzero ratio r approximate to 0.12 +/- 0.06, which is forbidden by the standard prediction (r = -8n(t)). The influence of relic gravitational waves on the cosmic microwave background may soon come within the range of planned measurements, offering a nontrivial test of the new predictions.",
optnote="ISI:000275898500028",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=479), last updated on Wed, 09 Mar 2011 22:06:52 +0000",
issn="1550-7998",
doi="10.1103/PhysRevD.81.043514",
opturl="http://arxiv.org/abs/0911.0961",
opturl="https://doi.org/10.1103/PhysRevD.81.043514",
archivePrefix="arXiv",
eprint="0911.0961",
language="English"
}