Simulated Dark-Matter Halos as a Test of Nonextensive Statistical Mechanics

Details Simulated Dark-Matter Halos as a Test of Nonextensive Statistical Mechanics Simulated Dark-Matter Halos as a Test of Nonextensive Statistical Mechanics

2008-01-16

arxiv.org/abs/0801.2504v1

Phys.Rev.E77:022106,2008

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Physical Review E

Scientific paper

10.1103/PhysRevE.77.022106

In the framework of nonextensive statistical mechanics, the equilibrium structures of astrophysical self-gravitating systems are stellar polytropes, parameterized by the polytropic index n. By careful comparison to the structures of simulated dark-matter halos we find that the density profiles, as well as other fundamental properties, of stellar polytropes are inconsistent with simulations for any value of n. This result suggests the need to reconsider the applicability of nonextensive statistical mechanics (in its simplest form) to equilibrium self-gravitating systems.

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