Velocity dispersion in N-body simulations of CDM models

Details Velocity dispersion in N-body simulations of CDM models Velocity dispersion in N-body simulations of CDM models

2001-03-20

arxiv.org/abs/astro-ph/0103313v2

Astron. Nachrichten 324 (2003) 560

Astronomy and Astrophysics

Astrophysics

Minor, unimportant changes. Matches published version

Scientific paper

This work reports on a study of the spatially coarse-grained velocity dispersion in cosmological N-body simulations (OCDM and Lambda-CDM models) as a function of time (redshifts z=0-4) and of the coarsening length (0.6-20 Mpc/h). The main result is the discovery of a polytropic relationship I_1 ~ rho^{2-eta} between the velocity-dispersion kinetic energy density of the coarsening cells, I_1, and their mass density, rho. The exponent eta, dependent on time and coarsening scale, is a compact measure of the deviations from the naive virial prediction eta_virial=0. This relationship supports the ``polytropic assumption'' which has been employed in theoretical models for the growth of cosmological structure by gravitational instability.

Affiliated with

Also associated with

No associations

Rating

Velocity dispersion in N-body simulations of CDM models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Velocity dispersion in N-body simulations of CDM models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Velocity dispersion in N-body simulations of CDM models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-2174