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Revising the predictions of inflation for the cosmic microwave background anisotropies

AuthorsAgulló, Iván ; Navarro-Salas, José ; Olmo, Gonzalo J. ; Parker, Leonard
Keywords[PACS] Cosmic background radiations
[PACS] Renormalization in quantum field theory
[PACS] Particle-theory and field-theory models of the early Universe
Issue Date4-Aug-2009
PublisherAmerican Physical Society
CitationPhysical Review Letters 103(6): 061301 (2009)
AbstractWe point out that, if quantum field renormalization is taken into account and the counterterms are evaluated at the Hubble-radius crossing time or few e-foldings after it, the predictions of slow-roll inflation for both the scalar and the tensorial power spectrum change significantly. This leads to a change in the consistency condition that relates the tensor-to-scalar amplitude ratio with spectral indices. A reexamination of the potentials Φ2 and Φ4 shows that both are compatible with five-year WMAP data. Only when the counterterms are evaluated at much larger times beyond the end of inflation does one recover the standard predictions. The alternative predictions presented here may soon come within the range of measurement of near-future experiments.
Description4 pages, 1 figure.-- PACS nrs.: 98.70.Vc; 11.10.Gh; 98.80.Cq.-- ArXiv pre-print available at: http://arxiv.org/abs/0901.0439
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.103.061301
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