CMB anisotropy: deviations from Gaussianity due to non-linear gravity

Details CMB anisotropy: deviations from Gaussianity due to non-linear gravity CMB anisotropy: deviations from Gaussianity due to non-linear gravity

2001-10-30

arxiv.org/abs/astro-ph/0110664v1

Mon.Not.Roy.Astron.Soc. 330 (2002) 625

Astronomy and Astrophysics

Astrophysics

6 latex pages with mn.sty, 3 eps figures. Accepted in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05095.x

Non-linear evolution of cosmological energy density fluctuations triggers deviations from Gaussianity in the temperature distribution of the cosmic microwave background. A method to estimate these deviations is proposed. N-body simulations -- in a $\Lambda$CDM cosmology -- are used to simulate the strongly non-linear evolution of cosmological structures. It is proved that these simulations can be combined with the potential approximation to calculate the statistical moments of the CMB anisotropies produced by non-linear gravity. Some of these moments are computed and the resulting values are different from those corresponding to Gaussianity.

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