Bayesian analysis of inflationary features in Planck and SDSS data

Abstract

We perform a Bayesian analysis to study possible features in the primordial inflationary power spectrum of scalar perturbations. In particular, we analyse the possibility of detecting the imprint of these primordial features in the anisotropy temperature power spectrum of the Cosmic Microwave Background (CMB) and also in the matter power spectrum P (k). We use the most recent CMB data provided by the Planck Collaboration and P (k) measurements from the eleventh data release of the Sloan Digital Sky Survey. We focus our analysis on a class of potentials whose features are localised at different intervals of angular scales, corresponding to multipoles in the ranges 10 < l < 60 (Oscill-1) and 150 < l < 300 (Oscill-2). Our results show that one of the step-potentials (Oscill-1) provides a better fit to the CMB data than does the featureless LCDM scenario, with a moderate Bayesian evidence in favor of the former. Adding the P (k) data to the analysis weakens the evidence of the Oscill-1 potential relative to the standard model and strengthens the evidence of this latter scenario with respect to the Oscill-2 model.

8 pages, 6 figures

References in corpus (5)

• Inflation and WMAP three year data: Features have a Future!
• CMB polarization features from inflation versus reionization
• New Constraints on Oscillations in the Primordial Spectrum of Inflationary Perturbations
• A Bayesian model selection analysis of WMAP3
• Combining power spectrum and bispectrum measurements to detect oscillatory features

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