Velocity dispersion inN-body simulations of CDM models
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Publication:4446925
DOI10.1002/ASNA.200310165zbMATH Open1047.70037arXivastro-ph/0103313OpenAlexW3103003515MaRDI QIDQ4446925
Author name not available (Why is that?)
Publication date: 3 February 2004
Published in: (Search for Journal in Brave)
Abstract: 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.
Full work available at URL: https://arxiv.org/abs/astro-ph/0103313
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