File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Weyl fluid dark matter model tested on the galactic scale by weak gravitational lensing

TitleWeyl fluid dark matter model tested on the galactic scale by weak gravitational lensing
Authors
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.org
Citation
Physical Review D - Particles, Fields, Gravitation And Cosmology, 2012, v. 86 n. 4 How to Cite?
AbstractThe higher-dimensional Weyl curvature induces on the brane a new source of gravity. This Weyl fluid of geometrical origin (reducing in the spherically symmetric, static configuration to a dark radiation and dark pressure) modifies spacetime geometry around galaxies and has been shown to explain the flatness of galactic rotation curves. Independent observations for discerning between the Weyl fluid and other dark matter models are necessary. Gravitational lensing could provide such a test. Therefore we study null geodesics and weak gravitational lensing in the dark radiation dominated region of galaxies in a class of spherically symmetric braneworld metrics. We find that the lensing profile in the braneworld scenario is distinguishable from dark matter lensing, despite both the braneworld scenario and dark matter models fitting the rotation curve data. In particular, in the asymptotic regions, light deflection is 18% enhanced as compared to dark matter halo predictions. For a linear equation of state of the Weyl fluid, we further find a critical radius below which braneworld effects reduce, while above it they amplify light deflection. This is in contrast to any dark matter model, the addition of which always increases the deflection angle. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/175215
ISSN
2014 Impact Factor: 4.643
2015 SCImago Journal Rankings: 1.882
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWong, KCen_US
dc.contributor.authorHarko, Ten_US
dc.contributor.authorCheng, KSen_US
dc.contributor.authorGergely, LAen_US
dc.date.accessioned2012-11-26T08:54:33Z-
dc.date.available2012-11-26T08:54:33Z-
dc.date.issued2012en_US
dc.identifier.citationPhysical Review D - Particles, Fields, Gravitation And Cosmology, 2012, v. 86 n. 4en_US
dc.identifier.issn1550-7998en_US
dc.identifier.urihttp://hdl.handle.net/10722/175215-
dc.description.abstractThe higher-dimensional Weyl curvature induces on the brane a new source of gravity. This Weyl fluid of geometrical origin (reducing in the spherically symmetric, static configuration to a dark radiation and dark pressure) modifies spacetime geometry around galaxies and has been shown to explain the flatness of galactic rotation curves. Independent observations for discerning between the Weyl fluid and other dark matter models are necessary. Gravitational lensing could provide such a test. Therefore we study null geodesics and weak gravitational lensing in the dark radiation dominated region of galaxies in a class of spherically symmetric braneworld metrics. We find that the lensing profile in the braneworld scenario is distinguishable from dark matter lensing, despite both the braneworld scenario and dark matter models fitting the rotation curve data. In particular, in the asymptotic regions, light deflection is 18% enhanced as compared to dark matter halo predictions. For a linear equation of state of the Weyl fluid, we further find a critical radius below which braneworld effects reduce, while above it they amplify light deflection. This is in contrast to any dark matter model, the addition of which always increases the deflection angle. © 2012 American Physical Society.en_US
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.orgen_US
dc.relation.ispartofPhysical Review D - Particles, Fields, Gravitation and Cosmologyen_US
dc.rightsPhysical Review D. Copyright © American Physical Society.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleWeyl fluid dark matter model tested on the galactic scale by weak gravitational lensingen_US
dc.typeArticleen_US
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_US
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_US
dc.identifier.authorityHarko, T=rp01333en_US
dc.identifier.authorityCheng, KS=rp00675en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1103/PhysRevD.86.044038en_US
dc.identifier.scopuseid_2-s2.0-84865448007en_US
dc.identifier.hkuros212602-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84865448007&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume86en_US
dc.identifier.issue4en_US
dc.identifier.isiWOS:000307810100002-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridWong, KC=36085523500en_US
dc.identifier.scopusauthoridHarko, T=7006485783en_US
dc.identifier.scopusauthoridCheng, KS=9745798500en_US
dc.identifier.scopusauthoridGergely, LA=7005499194en_US

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats