Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-16
Mon.Not.Roy.Astron.Soc.367:1095-1102,2006
Astronomy and Astrophysics
Astrophysics
9 pages, 8 figures. Revised version accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10031.x
We extend to large scales a method proposed in previous work that reconstructs non-parametrically the primordial power spectrum from cosmic microwave background data at high resolution. The improvement is necessary to account for the non-gaussianity of the Wilkinson Microwave Anisotropy Probe (WMAP) likelihood due primarily to cosmic variance. We assume the concordance LambdaCDM cosmology, utilise a smoothing prior and perform Monte Carlo simulations around an initial power spectrum that is scale-free and with spectral index n_s=0.97, very close to the concordance spectrum. The horizon scale for the model we are considering corresponds to the wavenumber k_h=4.52X10^{-4} Mpc^{-1}. We find some evidence for the presence of features and we quantify the probabilities of exceeding the observed deviations in WMAP data with respect to the fiducial models. We detect the following marginal departures from a scale-free (spectral index n_s=0.97) initial spectrum: a cut-off at 0.0001
Hoffman Yehuda
Silk Joseph
Tocchini-Valentini Domenico
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