Lagrangian reconstruction of cosmic velocity fields

Details Lagrangian reconstruction of cosmic velocity fields Lagrangian reconstruction of cosmic velocity fields

2008-01-28

arxiv.org/abs/0801.4208v1

Physica D237:2139-2144,2008

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures, contribution to the conference "Euler's Equations: 250 Years On" (see http://www.obs-nice.fr/etc7/EE250/);

Scientific paper

10.1016/j.physd.2008.02.016

We discuss a Lagrangian reconstruction method of the velocity field from galaxy redshift catalog that takes its root in the Euler equation. This results in a ``functional'' of the velocity field which must be minimized. This is helped by an algorithm solving the minimization of cost-flow problems. The results obtained by applying this method to cosmological problems are shown and boundary effects happening in real observational cases are then discussed. Finally, a statistical model of the errors made by the reconstruction method is proposed.

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