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Article: Galactic metric, dark radiation, dark pressure, and gravitational lensing in brane world models

TitleGalactic metric, dark radiation, dark pressure, and gravitational lensing in brane world models
Authors
KeywordsCosmology: theory
Galaxies: kinematics and dynamics
Gravitational lensing
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2006, v. 636 n. 1 I, p. 8-20 How to Cite?
AbstractIn the brane world scenario, the four-dimensional effective Einstein equation has extra terms that arise from the embedding of the 3-brane in the bulk. These nonlocal effects may provide an explanation for the dynamics of the neutral hydrogen clouds at large distances from the galactic center, which is usually explained by postulating the existence of the dark matter. We obtain the exact galactic metric, the dark radiation, and the dark pressure in the flat rotation curve region in the brane world scenario. Due to the presence of the bulk effects, the flat rotation curves could extend several hundred kiloparsecs. The limiting radius for which bulk effects are important is compared with the numerical values of the truncation parameter of the dark matter halos, obtained from weak-lensing observations. There is a relatively good agreement between the predictions of the model and observations. The deflection of photons in the flat rotation curve region is also considered. The bending angle predicted by the brane world models is much larger than that predicted by dark matter models. The angular radii of the Einstein rings are obtained in the small-angle approximation. The tangential shear is compared with the observational data obtained in the weak lensing of galaxies in the Red-Sequence Cluster Survey. The study of the light deflection by galaxies and the gravitational lensing could discriminate between the different dynamical laws proposed to model the motion of particles at the galactic level and the standard dark matter scenario. © 2006. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/91784
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-17T10:26:31Z-
dc.date.available2010-09-17T10:26:31Z-
dc.date.issued2006en_HK
dc.identifier.citationAstrophysical Journal Letters, 2006, v. 636 n. 1 I, p. 8-20en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91784-
dc.description.abstractIn the brane world scenario, the four-dimensional effective Einstein equation has extra terms that arise from the embedding of the 3-brane in the bulk. These nonlocal effects may provide an explanation for the dynamics of the neutral hydrogen clouds at large distances from the galactic center, which is usually explained by postulating the existence of the dark matter. We obtain the exact galactic metric, the dark radiation, and the dark pressure in the flat rotation curve region in the brane world scenario. Due to the presence of the bulk effects, the flat rotation curves could extend several hundred kiloparsecs. The limiting radius for which bulk effects are important is compared with the numerical values of the truncation parameter of the dark matter halos, obtained from weak-lensing observations. There is a relatively good agreement between the predictions of the model and observations. The deflection of photons in the flat rotation curve region is also considered. The bending angle predicted by the brane world models is much larger than that predicted by dark matter models. The angular radii of the Einstein rings are obtained in the small-angle approximation. The tangential shear is compared with the observational data obtained in the weak lensing of galaxies in the Red-Sequence Cluster Survey. The study of the light deflection by galaxies and the gravitational lensing could discriminate between the different dynamical laws proposed to model the motion of particles at the galactic level and the standard dark matter scenario. © 2006. The American Astronomical Society. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.subjectCosmology: theoryen_HK
dc.subjectGalaxies: kinematics and dynamicsen_HK
dc.subjectGravitational lensingen_HK
dc.titleGalactic metric, dark radiation, dark pressure, and gravitational lensing in brane world modelsen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityHarko, T=rp01333en_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1086/498141en_HK
dc.identifier.scopuseid_2-s2.0-33645692351en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33645692351&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume636en_HK
dc.identifier.issue1 Ien_HK
dc.identifier.spage8en_HK
dc.identifier.epage20en_HK
dc.identifier.isiWOS:000234288800002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHarko, T=7006485783en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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