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Article: The generalized virial theorem in f(R) gravity

TitleThe generalized virial theorem in f(R) gravity
Authors
KeywordsDark Matter
Gravity
Issue Date2008
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/journal/JCAP
Citation
Journal of Cosmology and Astroparticle Physics, 2008, v. 2008 n. 3 How to Cite?
AbstractWe generalize the virial theorem in f(R) modified gravity using the collisionless Boltzmann equation. We find supplementary geometric terms in the modified Einstein equation providing an effective contribution to the gravitational energy. The total virial mass is proportional to the effective mass associated with the new geometrical term, which may account for the well-known virial theorem mass discrepancy in clusters of galaxies. The model predicts that the geometric mass and its effects extend beyond the virial radius of the clusters. We also consider the behavior of the galaxy cluster velocity dispersion in f(R) models. The metric inside the galactic cluster, as well as the Lagrangian of the modified gravity model, are obtained in terms of quantities directly related to the physical properties of the clusters, and which can be determined from astrophysical observations. Thus, the f(R) virial theorem can be an efficient tool in observationally testing the viability of this class of generalized gravity models. © IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/91841
ISSN
2015 Impact Factor: 5.634
2015 SCImago Journal Rankings: 0.652
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorBöhmer, CGen_HK
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorLobo, FSNen_HK
dc.date.accessioned2010-09-17T10:28:10Z-
dc.date.available2010-09-17T10:28:10Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal of Cosmology and Astroparticle Physics, 2008, v. 2008 n. 3en_HK
dc.identifier.issn1475-7516en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91841-
dc.description.abstractWe generalize the virial theorem in f(R) modified gravity using the collisionless Boltzmann equation. We find supplementary geometric terms in the modified Einstein equation providing an effective contribution to the gravitational energy. The total virial mass is proportional to the effective mass associated with the new geometrical term, which may account for the well-known virial theorem mass discrepancy in clusters of galaxies. The model predicts that the geometric mass and its effects extend beyond the virial radius of the clusters. We also consider the behavior of the galaxy cluster velocity dispersion in f(R) models. The metric inside the galactic cluster, as well as the Lagrangian of the modified gravity model, are obtained in terms of quantities directly related to the physical properties of the clusters, and which can be determined from astrophysical observations. Thus, the f(R) virial theorem can be an efficient tool in observationally testing the viability of this class of generalized gravity models. © 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/journal/JCAPen_HK
dc.relation.ispartofJournal of Cosmology and Astroparticle Physicsen_HK
dc.subjectDark Matteren_HK
dc.subjectGravityen_HK
dc.titleThe generalized virial theorem 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.doi10.1088/1475-7516/2008/03/024en_HK
dc.identifier.scopuseid_2-s2.0-43049090831en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-43049090831&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume2008en_HK
dc.identifier.issue3en_HK
dc.identifier.isiWOS:000254787200005-
dc.identifier.citeulike2586642-

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