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Reconstructing the Primordial Power Spectrum

Published online by Cambridge University Press:  23 September 2016

S. L. Bridle ,
A. M. Lewis ,
J. Weller  and
G. Efstathiou
S. L. Bridle
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
A. M. Lewis
Affiliation:
CITA, 60 St. George St, Toronto M5S 3H8, ON, Canada
J. Weller
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
G. Efstathiou
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

Abstract

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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.

Type
Session I: Cosmic Microwave Background and Cosmology
Information
Symposium - International Astronomical Union , Volume 216: Maps of the Cosmos , 2005 , pp. 28 - 34
Copyright
Copyright © Astronomical Society of the Pacific 2005 

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