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Article: Testing Hořava-Lifshitz gravity using thin accretion disk properties

TitleTesting Hořava-Lifshitz gravity using thin accretion disk properties
Authors
KeywordsPhysics
Nuclear physics
Issue Date2009
PublisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.org
Citation
Physical Review D: Particles, Fields, Gravitation and Cosmology , 2009, v. 80 n. 4 article no. 044021 How to Cite?
AbstractRecently, a renormalizable gravity theory with higher spatial derivatives in four dimensions was proposed by Hořava. The theory reduces to Einstein gravity with a nonvanishing cosmological constant in IR, but it has improved UV behaviors. The spherically symmetric black hole solutions for an arbitrary cosmological constant, which represent the generalization of the standard Schwarzschild–(anti) de Sitter solution, have also been obtained for the Hořava-Lifshitz theory. The exact asymptotically flat Schwarzschild-type solution of the gravitational field equations in Hořava gravity contains a quadratic increasing term, as well as the square root of a fourth order polynomial in the radial coordinate, and it depends on one arbitrary integration constant. The IR-modified Hořava gravity seems to be consistent with the current observational data, but in order to test its viability more observational constraints are necessary. In the present paper we consider the possibility of observationally testing Hořava gravity by using the accretion disk properties around black holes. The energy flux, the temperature distribution, the emission spectrum, as well as the energy conversion efficiency are obtained, and compared to the standard general relativistic case. Particular signatures can appear in the electromagnetic spectrum, thus leading to the possibility of directly testing Hořava gravity models by using astrophysical observations of the emission spectra from accretion disks.
Persistent Identifierhttp://hdl.handle.net/10722/91855
ISSN
2014 Impact Factor: 4.643
2015 SCImago Journal Rankings: 1.882
ISI Accession Number ID
Funding AgencyGrant Number
government of the Hong Kong Special Administrative RegionHKU 701808P
Funding Information:

The work of T. H. was supported by the General Research Fund Grant No. HKU 701808P of the government of the Hong Kong Special Administrative Region.

Grants

 

DC FieldValueLanguage
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorKovács, Zen_HK
dc.contributor.authorLobo, FSNen_HK
dc.date.accessioned2010-09-17T10:28:34Z-
dc.date.available2010-09-17T10:28:34Z-
dc.date.issued2009en_HK
dc.identifier.citationPhysical Review D: Particles, Fields, Gravitation and Cosmology , 2009, v. 80 n. 4 article no. 044021en_HK
dc.identifier.issn1550-7998en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91855-
dc.description.abstractRecently, a renormalizable gravity theory with higher spatial derivatives in four dimensions was proposed by Hořava. The theory reduces to Einstein gravity with a nonvanishing cosmological constant in IR, but it has improved UV behaviors. The spherically symmetric black hole solutions for an arbitrary cosmological constant, which represent the generalization of the standard Schwarzschild–(anti) de Sitter solution, have also been obtained for the Hořava-Lifshitz theory. The exact asymptotically flat Schwarzschild-type solution of the gravitational field equations in Hořava gravity contains a quadratic increasing term, as well as the square root of a fourth order polynomial in the radial coordinate, and it depends on one arbitrary integration constant. The IR-modified Hořava gravity seems to be consistent with the current observational data, but in order to test its viability more observational constraints are necessary. In the present paper we consider the possibility of observationally testing Hořava gravity by using the accretion disk properties around black holes. The energy flux, the temperature distribution, the emission spectrum, as well as the energy conversion efficiency are obtained, and compared to the standard general relativistic case. Particular signatures can appear in the electromagnetic spectrum, thus leading to the possibility of directly testing Hořava gravity models by using astrophysical observations of the emission spectra from accretion disks.en_HK
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.orgen_HK
dc.relation.ispartofPhysical Review D: Particles, Fields, Gravitation and Cosmologyen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review D: Particles, Fields, Gravitation and Cosmology . Copyright © American Physical Society.-
dc.subjectPhysics-
dc.subjectNuclear physics-
dc.titleTesting Hořava-Lifshitz gravity using thin accretion disk propertiesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1550-7998&volume=80&issue=4 article no. 044021&spage=&epage=&date=2009&atitle=Testing+Hořava-Lifshitz+gravity+using+thin+accretion+disk+properties-
dc.identifier.emailHarko, T: harko@HKUCC.hku.hken_HK
dc.identifier.emailLobo, FSN: flobo@cii.fis.ul.pt-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevD.80.044021en_HK
dc.identifier.scopuseid_2-s2.0-70049086841-
dc.identifier.hkuros169442-
dc.identifier.volume80en_HK
dc.identifier.issue4 article no. 044021en_HK
dc.identifier.isiWOS:000269641400067-
dc.relation.projectBrane world cosmology: post-inflationary reheating and gravitational lensing-

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