Reconstructing the Primordial Power Spectrum

Details Reconstructing the Primordial Power Spectrum Reconstructing the Primordial Power Spectrum

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iaus..216...28b&link_type=abstract

Maps of the Cosmos, Proceedings of IAU Symposium No. 216, held during the IAU General Assembly XXV in Sydney, Australia, 14-17 J

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We reconstruct the shape of the primordial power spectrum from the latest cosmic microwave background data, including the new results from the Wilkinson Microwave Anisotropy Probe (WMAP), and large scale structure data from the two degree field galaxy redshift survey (2dFGRS). We discuss two parameterizations taking into account the uncertainties in four cosmological parameters. First we parameterize the initial spectrum by a tilt and a running spectral index, finding marginal evidence for a running spectral index only if the first three WMAP multipoles (ℓ=2,3,4) are included in the analysis. Secondly, to investigate further the low CMB large scale power, we modify the conventional power-law spectrum by introducing a scale above which there is no power. We find a preferred position of the cut at kc˜ 3×10-4 Mpc-1 although kc=0 (no cut) is not ruled out.

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