A new search for features in the primordial power spectrum

Authors: Tocchini-Valentini, Domenico; Douspis, Marian; Silk, Joseph

Source: Monthly Notices of the Royal Astronomical Society, Volume 359, Number 1, May 2005 , pp. 31-35(5)

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Abstract:

We develop a new approach towards a high-resolution non-parametric reconstruction of the primordial power spectrum using the Wilkinson Microwave Anisotropy Probe (WMAP) cosmic microwave background temperature anisotropies that we confront with Sloan Digital Sky Survey large-scale structure data in the range k∼ 0.01–0.1 h Mpc⁻¹ . We utilize the standard Λ cold dark matter cosmological model but we allow the baryon fraction to vary. In particular, for the concordance baryon fraction, we compare indications of a possible feature at k∼ 0.05 h Mpc⁻¹ in WMAP data with suggestions of similar features in large-scale structure surveys.

Keywords: methods: data analysis; cosmic microwave background; cosmological parameters; early Universe; large-scale structure of Universe

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-2966.2005.08771.x

Publication date: 2005-05-01