Non-Gaussian structure of the lensed CMB power spectra covariance matrix

被引：54

作者：

Benoit-Levy, Aurelien ^{[1
]}

Smith, Kendrick M. ^{[2
]}

Hu, Wayne ^{[3
]}

机构：

[1] UPMC CNRS, UMR7095, Inst Astrophys Paris, F-75014 Paris, France

[2] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[3] Univ Chicago, Kavli Inst Cosmol Phys, Dept Astron & Astrophys, Chicago, IL 60637 USA

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 12期

基金：

美国国家科学基金会;

关键词：

MICROWAVE BACKGROUND ANISOTROPIES; MATTER;

D O I：

10.1103/PhysRevD.86.123008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Gravitational lensing of the cosmic microwave background (CMB) encodes cosmological information in the observed anisotropies of temperature and polarization. Accurate extraction of this additional information requires precise modeling of the covariance matrix of the power spectra of observed CMB fields. We introduce a new analytical model to describe the non-Gaussian structure of this covariance matrix and display the importance of second-order terms that were previously neglected. When compared with direct numerical simulations our model captures parameter errors to better than a few percent for cases where the non-Gaussianity causes an order unity degradation in errors. We also provide a detailed comparison between the information content of lensed CMB power spectra and ideal reconstruction of the lensing potential. We illustrate the impact of the non-Gaussian terms in the power spectrum covariance by providing Fisher errors on the sum of the masses of the neutrinos, the dark energy equation of state, and the curvature of the Universe. DOI: 10.1103/PhysRevD.86.123008

引用

页数：15

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