Impact of secondary non-Gaussianities in the CMB on cosmological parameter estimation

Joseph Smidt, Shahab Joudaki, Alexandre Amblard, Paolo Serra, and Asantha Cooray
Phys. Rev. D 81, 123528 – Published 24 June 2010

Abstract

We consider corrections to the underlying cosmology due to secondary contributions from weak gravitational lensing, the integrated Sachs-Wolfe effect, and the Sunyaev-Zel’dovich effect contained in the trispectrum. We incorporate these additional contributions to the covariance of a binned angular power spectrum of temperature anisotropies in the analysis of current and prospective data sets. Although recent experiments such as the Arcminute Cosmology Bolometer Array Receiver and the Cosmic Background Imager are not particularly sensitive to these additional non-Gaussian effects, the interpretation of Planck and CMBPol anisotropy spectra will require an accounting of non-Gaussian covariance leading to a degradation in cosmological parameter estimates by up to 20% and 30%, respectively.

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  • Received 18 September 2009

DOI:https://doi.org/10.1103/PhysRevD.81.123528

©2010 American Physical Society

Authors & Affiliations

Joseph Smidt, Shahab Joudaki, Alexandre Amblard, Paolo Serra, and Asantha Cooray

  • Center for Cosmology, Department of Physics and Astronomy, University of California, Irvine, California 92697, USA

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Issue

Vol. 81, Iss. 12 — 15 June 2010

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