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Article: Dark matter as a geometric effect in f (R) gravity

TitleDark matter as a geometric effect in f (R) gravity
Authors
KeywordsDark Matter
F (R) Gravity
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/astropartphys
Citation
Astroparticle Physics, 2008, v. 29 n. 6, p. 386-392 How to Cite?
AbstractWe consider the behavior of the tangential velocity of test particles moving in stable circular orbits in f (R) modified theories of gravity. A large number of observations at the galactic scale have shown that the rotational velocities of massive test particles (hydrogen clouds) tend towards constant values at large distances from the galactic center. We analyze the vacuum gravitational field equations in f (R) models in the constant velocity region, and the general form of the metric tensor is derived in a closed form. The resulting modification of the Einstein-Hilbert Lagrangian is of the form R1 + n, with the parameter n expressed in terms of the tangential velocity. Therefore we find that to explain the motion of test particles around galaxies requires only very mild deviations from classical general relativity, and that modified gravity can explain the galactic dynamics without the need of introducing dark matter. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/91850
ISSN
2015 Impact Factor: 3.425
2015 SCImago Journal Rankings: 1.612
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorBöhmer, CGen_HK
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorLobo, FSNen_HK
dc.date.accessioned2010-09-17T10:28:26Z-
dc.date.available2010-09-17T10:28:26Z-
dc.date.issued2008en_HK
dc.identifier.citationAstroparticle Physics, 2008, v. 29 n. 6, p. 386-392en_HK
dc.identifier.issn0927-6505en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91850-
dc.description.abstractWe consider the behavior of the tangential velocity of test particles moving in stable circular orbits in f (R) modified theories of gravity. A large number of observations at the galactic scale have shown that the rotational velocities of massive test particles (hydrogen clouds) tend towards constant values at large distances from the galactic center. We analyze the vacuum gravitational field equations in f (R) models in the constant velocity region, and the general form of the metric tensor is derived in a closed form. The resulting modification of the Einstein-Hilbert Lagrangian is of the form R1 + n, with the parameter n expressed in terms of the tangential velocity. Therefore we find that to explain the motion of test particles around galaxies requires only very mild deviations from classical general relativity, and that modified gravity can explain the galactic dynamics without the need of introducing dark matter. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/astropartphysen_HK
dc.relation.ispartofAstroparticle Physicsen_HK
dc.rightsAstroparticle Physics. Copyright © Elsevier BV.-
dc.subjectDark Matteren_HK
dc.subjectF (R) Gravityen_HK
dc.titleDark matter as a geometric effect in f (R) gravityen_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.doi10.1016/j.astropartphys.2008.04.003en_HK
dc.identifier.scopuseid_2-s2.0-46749144491en_HK
dc.identifier.hkuros149103-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-46749144491&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume29en_HK
dc.identifier.issue6en_HK
dc.identifier.spage386en_HK
dc.identifier.epage392en_HK
dc.identifier.isiWOS:000258366000005-
dc.identifier.citeulike3042791-

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