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Article: Two-fluid dark matter models
Title | Two-fluid dark matter models | ||||||
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Authors | |||||||
Issue Date | 2011 | ||||||
Publisher | American Physical Society. The Journal's web site is located at http://prd.aps.org | ||||||
Citation | Physical Review D (Particles, Fields, Gravitation and Cosmology), 2011, v. 83 n. 12, article no. 124051 How to Cite? | ||||||
Abstract | We investigate the possibility that dark matter is a mixture of two noninteracting perfect fluids, with different four-velocities and thermodynamic parameters. The two-fluid model can be described as an effective single anisotropic fluid, with distinct radial and tangential pressures. The basic equations describing the equilibrium structure of the two-fluid dark matter model, and of the tangential velocity of test particles in stable circular orbits, are obtained for the case of a spherically symmetric static geometry. By assuming a nonrelativistic kinetic model for the dark matter particles, the density profile and the tangential velocity of the dark matter mixture are obtained by numerically integrating the gravitational field equations. The cosmological implications of the model are also briefly considered, and it is shown that the anisotropic two-fluid model isotropizes in the large-time limit. © 2011 American Physical Society. | ||||||
Persistent Identifier | http://hdl.handle.net/10722/142483 | ||||||
ISSN | 2014 Impact Factor: 4.643 | ||||||
ISI Accession Number ID |
Funding Information: The work of TH was supported by a GRF grant of the government of the Hong Kong SAR. FSNL acknowledges financial support of the Fundacao para a Ciencia e Tecnologia through the grants PTDC/FIS/102742/2008 and CERN/FP/116398/2010. |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Harko, T | en_US |
dc.contributor.author | Lobo, FSN | en_US |
dc.date.accessioned | 2011-10-28T02:46:53Z | - |
dc.date.available | 2011-10-28T02:46:53Z | - |
dc.date.issued | 2011 | en_US |
dc.identifier.citation | Physical Review D (Particles, Fields, Gravitation and Cosmology), 2011, v. 83 n. 12, article no. 124051 | en_US |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/10722/142483 | - |
dc.description.abstract | We investigate the possibility that dark matter is a mixture of two noninteracting perfect fluids, with different four-velocities and thermodynamic parameters. The two-fluid model can be described as an effective single anisotropic fluid, with distinct radial and tangential pressures. The basic equations describing the equilibrium structure of the two-fluid dark matter model, and of the tangential velocity of test particles in stable circular orbits, are obtained for the case of a spherically symmetric static geometry. By assuming a nonrelativistic kinetic model for the dark matter particles, the density profile and the tangential velocity of the dark matter mixture are obtained by numerically integrating the gravitational field equations. The cosmological implications of the model are also briefly considered, and it is shown that the anisotropic two-fluid model isotropizes in the large-time limit. © 2011 American Physical Society. | - |
dc.language | eng | en_US |
dc.publisher | American Physical Society. The Journal's web site is located at http://prd.aps.org | - |
dc.relation.ispartof | Physical Review D (Particles, Fields, Gravitation and Cosmology) | en_US |
dc.rights | Copyright 2011 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevD.83.124051 | - |
dc.title | Two-fluid dark matter models | en_US |
dc.type | Article | en_US |
dc.identifier.email | Harko, T: harko@hkucc.hku.hk | en_US |
dc.identifier.email | Lobo, FSN: flobo@cii.fc.ul.pt | - |
dc.identifier.authority | Harko, TC=rp01333 | en_US |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevD.83.124051 | - |
dc.identifier.scopus | eid_2-s2.0-79960757209 | - |
dc.identifier.hkuros | 196861 | en_US |
dc.identifier.volume | 83 | en_US |
dc.identifier.issue | 12 | - |
dc.identifier.spage | article no. 124051 | - |
dc.identifier.epage | article no. 124051 | - |
dc.identifier.isi | WOS:000292240500002 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 1550-2368 | - |