Evolution of the cosmological density distribution function

Details Evolution of the cosmological density distribution function Evolution of the cosmological density distribution function

2000-01-07

arxiv.org/abs/astro-ph/0001118v1

Astronomy and Astrophysics

Astrophysics

7 pages, 7 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03339.x

We present a new calculation for the evolution of the 1-point Probability Distribution Function (PDF) of the cosmological density field based on an exact statistical treatment. Using the Chapman-Kolmogorov equation and second-order Eulerian perturbation theory we propagate the initial density distribution into the nonlinear regime. Our calculations yield the moment generating function, allowing a straightforward derivation of the skewness of the PDF to second order. We find a new dependency on the initial perturbation spectrum. We compare our results with other approximations to the 1-pt PDF, and with N-body simulations. We find that our distribution accurately models the evolution of the 1-pt PDF of dark matter.

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