CMB anisotropy: deviations from Gaussianity due to non-linear gravity
Astrophysics
2009-11-07 v1
Abstract
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 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.
Cite
@article{arxiv.astro-ph/0110664,
title = {CMB anisotropy: deviations from Gaussianity due to non-linear gravity},
author = {A. M. Aliaga and V. Quilis and J. V. Arnau and D. Saez},
journal= {arXiv preprint arXiv:astro-ph/0110664},
year = {2009}
}
Comments
6 latex pages with mn.sty, 3 eps figures. Accepted in MNRAS