Revising the predictions of inflation for the cosmic microwave background anisotropies

Details Revising the predictions of inflation for the cosmic microwave background anisotropies Revising the predictions of inflation for the cosmic microwave background anisotropies

2009-01-05

arxiv.org/abs/0901.0439v2

Phys.Rev.Lett.103:061301,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 1 figure. Expanded version. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.103.061301

We 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 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 $\bf{\phi^2, \phi^4}$, 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 one recovers the standard predictions. The alternative predictions presented here may soon come within the range of measurement of near-future experiments.

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