Velocity Distributions from Nonextensive Thermodynamics

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dc.creatorBarnes, Eric I.
dc.creatorWilliams, Liliya L. R.
dc.creatorBabul, Arif
dc.creatorDalcanton, Julianne J.
dc.date2006-10-05
dc.date.accessioned2026-07-07T10:40:22Z
dc.date.available2026-07-07T10:40:22Z
dc.descriptionThere is no accepted mechanism that explains the equilibrium structures that form in collisionless cosmological N-body simulations. Recent work has identified nonextensive thermodynamics as an innovative approach to the problem. The distribution function that results from adopting this framework has the same form as for polytropes, but the polytropic index is now related to the degree of nonextensiveness. In particular, the nonextensive approach can mimic the equilibrium structure of dark matter density profiles found in simulations. We extend the investigation of this approach to the velocity structures expected from nonextensive thermodynamics. We find that the nonextensive and simulated N-body rms-velocity distributions do not match one another. The nonextensive rms-velocity profile is either monotonically decreasing or displays little radial variation, each of which disagrees with the rms-velocity distributions seen in simulations. We conclude that the currently discussed nonextensive models require further modifications in order to corroborate dark matter halo simulations. (adapted from TeX)
dc.description3 color figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0610153
dc.identifierhttp://arxiv.org/abs/astro-ph/0610153
dc.identifierAstrophys.J.655:847-850,2007
dc.identifierdoi:10.1086/509871
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181318
dc.subjectAstrophysics
dc.titleVelocity Distributions from Nonextensive Thermodynamics
dc.typetext

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