Nonlinear CMB temperature anisotropy from gravitational perturbations

Gao X.

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Nonlinear CMB temperature anisotropy from gravitational perturbations

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摘要

Nonlinear CMB temperature anisotropies up to the third order on large scales are calculated. On large scales and in the Sachs-Wolfe limit, we give the explicit expression for the observed temperature anisotropy in terms of the primordial curvature perturbation up to the third order. We derived the final bispectrum and trispectrum of anisotropies and the corresponding nonlinear parameters, in which the contributions to the observed non-Gaussianity from primordial perturbations and from the nonlinear mapping from primordial curvature perturbation to the temperature anisotropy are transparently separated.

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《Physical review, D. Particles, fields, gravitation, and cosmology》 |2010年第1期|103004-1-103004-10|共10页
作者
Gao X.;
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作者单位

Kavli Institute for Theoretical Physics China, Key Laboratory of Frontiers in Theoretical Physics, Chinese Academy of Sciences, No. 55, Zhong Guan Cun East Road, Hai Dian District, Beijing, 100190, China;

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正文语种英语
中图分类粒子物理学;
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Nonlinear CMB temperature anisotropy from gravitational perturbations

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