Constraining the shape of the CMB: a Peak-by-Peak analysis

Details Constraining the shape of the CMB: a Peak-by-Peak analysis Constraining the shape of the CMB: a Peak-by-Peak analysis

2002-07-12

arxiv.org/abs/astro-ph/0207286v3

Phys.Rev. D67 (2003) 083511

Astronomy and Astrophysics

Astrophysics

11 pages, 9 figures. Revised version with results from latest Cosmic Microwave Background experiments. Version with High-Res f

Scientific paper

10.1103/PhysRevD.67.083511

The recent measurements of the power spectrum of Cosmic Microwave Background anisotropies are consistent with the simplest inflationary scenario and big bang nucleosynthesis constraints. However, these results rely on the assumption of a class of models based on primordial adiabatic perturbations, cold dark matter and a cosmological constant. In this paper we investigate the need for deviations from the $\Lambda$-CDM scenario by first characterizing the spectrum using a phenomenological function in a 15 dimensional parameter space. Using a Monte Carlo Markov chain approach to Bayesian inference and a low curvature model template we then check for the presence of new physics and/or systematics in the CMB data. We find an almost perfect consistency between the phenomenological fits and the standard $\Lambda$-CDM models. The improved spectral resolution expected from future satellite experiments is warranted for a definitive test of the scenario.

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