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Article: Testing Hořava-Lifshitz gravity using thin accretion disk properties
Title | Testing Hořava-Lifshitz gravity using thin accretion disk properties | ||||
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Authors | |||||
Keywords | Physics Nuclear physics | ||||
Issue Date | 2009 | ||||
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 , 2009, v. 80 n. 4 article no. 044021 How to Cite? | ||||
Abstract | Recently, 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 Identifier | http://hdl.handle.net/10722/91855 | ||||
ISSN | 2014 Impact Factor: 4.643 2015 SCImago Journal Rankings: 1.882 | ||||
ISI Accession Number ID |
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 Field | Value | Language |
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dc.contributor.author | Harko, T | en_HK |
dc.contributor.author | Kovács, Z | en_HK |
dc.contributor.author | Lobo, FSN | en_HK |
dc.date.accessioned | 2010-09-17T10:28:34Z | - |
dc.date.available | 2010-09-17T10:28:34Z | - |
dc.date.issued | 2009 | en_HK |
dc.identifier.citation | Physical Review D: Particles, Fields, Gravitation and Cosmology , 2009, v. 80 n. 4 article no. 044021 | en_HK |
dc.identifier.issn | 1550-7998 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/91855 | - |
dc.description.abstract | Recently, 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.language | eng | en_HK |
dc.publisher | American Physical Society. The Journal's web site is located at http://prd.aps.org | en_HK |
dc.relation.ispartof | Physical Review D: Particles, Fields, Gravitation and Cosmology | en_HK |
dc.rights | Creative Commons: Attribution 3.0 Hong Kong License | - |
dc.rights | Physical Review D: Particles, Fields, Gravitation and Cosmology . Copyright © American Physical Society. | - |
dc.subject | Physics | - |
dc.subject | Nuclear physics | - |
dc.title | Testing Hořava-Lifshitz gravity using thin accretion disk properties | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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.email | Harko, T: harko@HKUCC.hku.hk | en_HK |
dc.identifier.email | Lobo, FSN: flobo@cii.fis.ul.pt | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevD.80.044021 | en_HK |
dc.identifier.scopus | eid_2-s2.0-70049086841 | - |
dc.identifier.hkuros | 169442 | - |
dc.identifier.volume | 80 | en_HK |
dc.identifier.issue | 4 article no. 044021 | en_HK |
dc.identifier.isi | WOS:000269641400067 | - |
dc.relation.project | Brane world cosmology: post-inflationary reheating and gravitational lensing | - |