Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-13
Phys.Rev.D74:023502,2006
Astronomy and Astrophysics
Astrophysics
11 pages, 6 figures
Scientific paper
10.1103/PhysRevD.74.023502
We extract parameters relevant for distinguishing among single-field inflation models from the Wilkinson Microwave Anisotropy Probe (WMAP) three-year data set, and also from WMAP in combination with the Sloan Digital Sky Survey (SDSS) galaxy power spectrum. Our analysis leads to the following conclusions: 1) the Harrison--Zel'dovich model is consistent with both data sets at a 95% confidence level; 2) there is no strong evidence for running of the spectral index of scalar perturbations; 3) Potentials of the form V \propto \phi^p are consistent with the data for p = 2, and are marginally consistent with the WMAP data considered alone for p = 4, but ruled out by WMAP combined with SDSS. We perform a "Monte Carlo reconstruction" of the inflationary potential, and find that: 1) there is no evidence to support an observational lower bound on the amplitude of gravitational waves produced during inflation; 2) models such as simple hybrid potentials which evolve toward an inflationary late-time attractor in the space of flow parameters are strongly disfavored by the data, 3) models selected with even a weak slow-roll prior strongly cluster in the region favoring a "red" power spectrum and no running of the spectral index, consistent with simple single-field inflation models.
Kinney William H.
Kolb Edward W.
Melchiorri Alessandro
Riotto Antonio
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