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Article: Galactic dark matter as a bulk effect on the brane

TitleGalactic dark matter as a bulk effect on the brane
Authors
Issue Date2007
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/cqg
Citation
Classical and Quantum Gravity, 2007, v. 24 n. 13, p. 3191-3209 How to Cite?
AbstractThe behaviour of the angular velocity of a test particle moving in a stable circular orbit in the vacuum on the brane is considered. In the braneworld scenario, the four-dimensional effective Einstein equation acquires extra terms, called dark radiation and dark pressure, respectively, which arise from the embedding of the 3-brane in the bulk. A large number of independent observations have shown that the rotational velocities of test particles gravitating around galaxies tend, as a function of the distance from the galactic centre, towards constant values. By assuming a constant tangential velocity, the general solution of the vacuum gravitational field equations on the brane can be obtained in an exact analytic form. This allows us to obtain the explicit form of the projections of the bulk Weyl tensor on the brane, and the equation of state of the dark pressure as a function of the dark radiation. The physical and geometrical quantities are expressed in terms of observable/measurable parameters, such as the tangential velocity, the baryonic mass and the radius of the galaxy. We also analyse the dynamics of test particles by using methods from the qualitative analysis of dynamical systems, by assuming a simple linear equation of state for the dark pressure. The obtained results provide a theoretical framework for the observational testing at the extra-galactic scale of the predictions of the braneworld models. © 2007 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/91808
ISSN
2015 Impact Factor: 2.837
2015 SCImago Journal Rankings: 1.633
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorBöhmer, CGen_HK
dc.contributor.authorHarko, Ten_HK
dc.date.accessioned2010-09-17T10:27:13Z-
dc.date.available2010-09-17T10:27:13Z-
dc.date.issued2007en_HK
dc.identifier.citationClassical and Quantum Gravity, 2007, v. 24 n. 13, p. 3191-3209en_HK
dc.identifier.issn0264-9381en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91808-
dc.description.abstractThe behaviour of the angular velocity of a test particle moving in a stable circular orbit in the vacuum on the brane is considered. In the braneworld scenario, the four-dimensional effective Einstein equation acquires extra terms, called dark radiation and dark pressure, respectively, which arise from the embedding of the 3-brane in the bulk. A large number of independent observations have shown that the rotational velocities of test particles gravitating around galaxies tend, as a function of the distance from the galactic centre, towards constant values. By assuming a constant tangential velocity, the general solution of the vacuum gravitational field equations on the brane can be obtained in an exact analytic form. This allows us to obtain the explicit form of the projections of the bulk Weyl tensor on the brane, and the equation of state of the dark pressure as a function of the dark radiation. The physical and geometrical quantities are expressed in terms of observable/measurable parameters, such as the tangential velocity, the baryonic mass and the radius of the galaxy. We also analyse the dynamics of test particles by using methods from the qualitative analysis of dynamical systems, by assuming a simple linear equation of state for the dark pressure. The obtained results provide a theoretical framework for the observational testing at the extra-galactic scale of the predictions of the braneworld models. © 2007 IOP Publishing Ltd.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/cqgen_HK
dc.relation.ispartofClassical and Quantum Gravityen_HK
dc.titleGalactic dark matter as a bulk effect on the braneen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, TC:harko@hkucc.hku.hken_HK
dc.identifier.authorityHarko, TC=rp1333en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0264-9381/24/13/004en_HK
dc.identifier.scopuseid_2-s2.0-34250775409en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34250775409&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue13en_HK
dc.identifier.spage3191en_HK
dc.identifier.epage3209en_HK
dc.identifier.eissn1361-6382-
dc.identifier.isiWOS:000247343500005-
dc.identifier.citeulike1396317-

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