6533b7d2fe1ef96bd125dfa3

RESEARCH PRODUCT

Cosmic microwave background anisotropy: deviations from Gaussianity caused by non-linear gravity

A. M. AliagaV. QuilisJ. V. ArnauD. Sáez

subject

PhysicsGravity (chemistry)Cosmic microwave backgroundAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsCosmologyGeneral Relativity and Quantum CosmologyNonlinear systemDistribution (mathematics)Space and Planetary ScienceEnergy densityStatistical physicsAnisotropy

description

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 aCDM 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.

yearjournalcountryeditionlanguage
2002-03-01Monthly Notices of the Royal Astronomical Society
https://doi.org/10.1046/j.1365-8711.2002.05095.x