Inflation model constraints from the Wilkinson Microwave Anisotropy Probe three-year data

By W. Kinney, E. Kolb, A. Melchiorri, A. Riotto. 2006

136 citations recorded by the source corpus.

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 / φ 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e4b7b4087da2238801394d699bb765779a44290e

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Citations in the corpus

B-mode contamination by synchrotron emission from 3-yr Wilkinson Microwave Anisotropy Probe data (2006, unknown): “In fact, its power spectrum on degree scales has a linear dependence on the tensor-to-scalar perturbation power ratio T/S, which measures the amount of primordial GW (e.g. Boyle et al. 2006; Kinney et al. 2006).”
THE ATACAMA COSMOLOGY TELESCOPE: COSMOLOGICAL PARAMETERS FROM THE 2008 POWER SPECTRUM (2010, background): “Cosmological constraints on deviations from scale invariance have been considered recently by e.g., Easther & Peiris (2006); Kinney et al. (2006); Shafieloo & Souradeep (2008); Verde & Peiris (2008); Reichardt et al. (2009), using various parameterizations.”