Skewness of Cosmic Microwave Background Temperature Fluctuations Due to Non-linear Gravitational Instability

Details Skewness of Cosmic Microwave Background Temperature Fluctuations Due to Non-linear Gravitational Instability Skewness of Cosmic Microwave Background Temperature Fluctuations Due to Non-linear Gravitational Instability

1995-01-28

arxiv.org/abs/astro-ph/9501100v2

Astrophys.J. 454 (1995) 552

Astronomy and Astrophysics

Astrophysics

The final version to appear in ApJ, minor changes are made and 3 references are added

Scientific paper

10.1086/176508

Skewness of temperature fluctuations of the cosmic microwave background (CMB) produced by initially Gaussian adiabatic perturbations with the flat (Harrison-Zeldovich) spectrum, which arises due to non-linear corrections to a gravitational potential at the matter-dominated stage, is calculated quantitatively. For the standard CDM model, the effect appears to be smaller than expected previously and lies below the cosmic variance limit even for small angles. The sign of the skewness is opposite to that of the skewness of density perturbations.

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