CMB maps lensed by cosmological structures: Simulations and statistical analysis

Details CMB maps lensed by cosmological structures: Simulations and statistical analysis CMB maps lensed by cosmological structures: Simulations and statistical analysis

2005-04-20

arxiv.org/abs/astro-ph/0504448v1

Astrophys.J. 628 (2005) 1-13

Astronomy and Astrophysics

Astrophysics

28 pages, 11 figures, accepted for publication in ApJ

Scientific paper

10.1086/431172

A method for ray-tracing through n-body simulations has been recently proposed. It is based on a periodic universe covered by simulation boxes. Photons move along appropriate directions to avoid periodicity effects. Here, an improved version of this method is applied to simulate lensed CMB maps and maps of lens deformations. Particle mesh n-body simulations with appropriate boxes and resolutions are used to evolve the nonlinear inhomogeneities until present time. The resulting maps are statistically analyzed to look for deviations from Gaussianity. These deviations are measured --for the first time-- using correlations for configurations of n directions (n being smaller than 7). A wide range of angular scales are considered. Some interesting prospects are outlined.

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