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

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 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.

9 pages. Fixed some typos

References in corpus (5)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• High resolution CMB power spectrum from the complete ACBAR data set
• CMBPol Mission Concept Study: Probing Inflation with CMB Polarization
• Cosmic Microwave Weak lensing data as a test for the dark universe
• CMB Lensing Constraints on Dark Energy and Modified Gravity Scenarios

Cited by in corpus (6)

• Dark degeneracy I: Dynamical or interacting dark energy?
• Dark Energy and Neutrino Masses from Future Measurements of the Expansion History and Growth of Structure
• Properties and uncertainties of scalar field models of dark energy with barotropic equation of state
• The Morphology of the Thermal Sunyaev-Zel'dovich Sky
• Cross-correlating Sunyaev-Zel'dovich and Weak Lensing Maps
• Reconstructing the Thermal Sunyaev-Zel'dovich Effect in 3D