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- Publisher Website: 10.1103/PhysRevD.86.044038
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Article: Weyl fluid dark matter model tested on the galactic scale by weak gravitational lensing
Title | Weyl fluid dark matter model tested on the galactic scale by weak gravitational lensing |
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Authors | |
Issue Date | 2012 |
Publisher | American 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, article no. 044038 How to Cite? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/175215 |
ISSN | 2014 Impact Factor: 4.643 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Wong, KC | en_US |
dc.contributor.author | Harko, T | en_US |
dc.contributor.author | Cheng, KS | en_US |
dc.contributor.author | Gergely, LA | en_US |
dc.date.accessioned | 2012-11-26T08:54:33Z | - |
dc.date.available | 2012-11-26T08:54:33Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.citation | Physical Review D (Particles, Fields, Gravitation and Cosmology), 2012, v. 86 n. 4, article no. 044038 | - |
dc.identifier.issn | 1550-7998 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/175215 | - |
dc.description.abstract | The 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.language | eng | en_US |
dc.publisher | American Physical Society. The Journal's web site is located at http://prd.aps.org | en_US |
dc.relation.ispartof | Physical Review D (Particles, Fields, Gravitation and Cosmology) | - |
dc.rights | Copyright 2012 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevD.86.044038 | - |
dc.title | Weyl fluid dark matter model tested on the galactic scale by weak gravitational lensing | en_US |
dc.type | Article | en_US |
dc.identifier.email | Harko, T: harko@hkucc.hku.hk | en_US |
dc.identifier.email | Cheng, KS: hrspksc@hkucc.hku.hk | en_US |
dc.identifier.authority | Harko, T=rp01333 | en_US |
dc.identifier.authority | Cheng, KS=rp00675 | en_US |
dc.description.nature | published_or_final_version | en_US |
dc.identifier.doi | 10.1103/PhysRevD.86.044038 | en_US |
dc.identifier.scopus | eid_2-s2.0-84865448007 | en_US |
dc.identifier.hkuros | 212602 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-84865448007&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 86 | en_US |
dc.identifier.issue | 4 | en_US |
dc.identifier.spage | article no. 044038 | - |
dc.identifier.epage | article no. 044038 | - |
dc.identifier.isi | WOS:000307810100002 | - |
dc.publisher.place | United States | en_US |
dc.identifier.scopusauthorid | Wong, KC=36085523500 | en_US |
dc.identifier.scopusauthorid | Harko, T=7006485783 | en_US |
dc.identifier.scopusauthorid | Cheng, KS=9745798500 | en_US |
dc.identifier.scopusauthorid | Gergely, LA=7005499194 | en_US |
dc.identifier.issnl | 1550-2368 | - |