The Impact of Secondary non-Gaussianities in the CMB on Cosmological Parameter Estimation

Details The Impact of Secondary non-Gaussianities in the CMB on Cosmological Parameter Estimation The Impact of Secondary non-Gaussianities in the CMB on Cosmological Parameter Estimation

2009-09-19

arxiv.org/abs/0909.3515v3

Phys.Rev.D81:123528,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages. Fixed some typos

Scientific paper

10.1103/PhysRevD.81.123528

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 ACBAR and CBI 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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