The Statistics of the large-scale Velocity Field

Details The Statistics of the large-scale Velocity Field The Statistics of the large-scale Velocity Field

1996-01-15

arxiv.org/abs/astro-ph/9601083v1

Astronomy and Astrophysics

Astrophysics

6 pages, LaTeX file with 4 figures, to appear in the proceedings "Mapping, Measuring and Modelling the Universe", Valencia Sep

Scientific paper

A lot of predictions for the statistical properties of the cosmic velocity field at large-scale have been obtained recently using perturbation theory. In this contribution I report the outcomes of a set of numerical tests that aim to check these results. Using Voronoi and Delaunay tessellations for defining the velocity field by interpolation between the particle velocities in numerical simulations, we have been able to get reliable estimates of the local velocity gradients. Thus, we have been able to show that the properties of the velocity divergence are in very good agreement with the analytical results. In particular we have confirmed the $\Omega$ dependence expected for the shape of its distribution function.

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