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Article: Thin accretion disk signatures in dynamical Chern-Simons-modified gravity

TitleThin accretion disk signatures in dynamical Chern-Simons-modified gravity
Authors
Issue Date2010
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/cqg
Citation
Classical and Quantum Gravity, 2010, v. 27 n. 10, article no. 105010 How to Cite?
AbstractA promising extension of general relativity is Chern-Simons (CS)-modified gravity, in which the Einstein-Hilbert action is modified by adding a parity-violating CS term, which couples to gravity via a scalar field. In this work, we consider the interesting, yet relatively unexplored, dynamical formulation of CS-modified gravity, where the CS coupling field is treated as a dynamical field, endowed with its own stress-energy tensor and evolution equation. We consider the possibility of observationally testing dynamical CS-modified gravity by using the accretion disk properties around slowly rotating black holes. The energy flux, temperature distribution, the emission spectrum as well as the energy conversion efficiency are obtained, and compared to the standard general relativistic Kerr solution. It is shown that the Kerr black hole provides a more efficient engine for the transformation of the energy of the accreting mass into radiation than their slowly rotating counterparts in CS-modified gravity. Specific signatures appear in the electromagnetic spectrum, thus leading to the possibility of directly testing CS-modified gravity by using astrophysical observations of the emission spectra from accretion disks. © 2010 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/91781
ISSN
2015 Impact Factor: 2.837
2015 SCImago Journal Rankings: 1.633
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Special Administrative RegionHKU 701808P
Funding Information:

We would like to thank the two anonymous referees whose comments and suggestions helped us to significantly improve the manuscript. The work of TH was supported by the General Research Fund grant number HKU 701808P of the government of the Hong Kong Special Administrative Region.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorKovcs, Zen_HK
dc.contributor.authorLobo, FSNen_HK
dc.date.accessioned2010-09-17T10:26:26Z-
dc.date.available2010-09-17T10:26:26Z-
dc.date.issued2010en_HK
dc.identifier.citationClassical and Quantum Gravity, 2010, v. 27 n. 10, article no. 105010en_HK
dc.identifier.issn0264-9381en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91781-
dc.description.abstractA promising extension of general relativity is Chern-Simons (CS)-modified gravity, in which the Einstein-Hilbert action is modified by adding a parity-violating CS term, which couples to gravity via a scalar field. In this work, we consider the interesting, yet relatively unexplored, dynamical formulation of CS-modified gravity, where the CS coupling field is treated as a dynamical field, endowed with its own stress-energy tensor and evolution equation. We consider the possibility of observationally testing dynamical CS-modified gravity by using the accretion disk properties around slowly rotating black holes. The energy flux, temperature distribution, the emission spectrum as well as the energy conversion efficiency are obtained, and compared to the standard general relativistic Kerr solution. It is shown that the Kerr black hole provides a more efficient engine for the transformation of the energy of the accreting mass into radiation than their slowly rotating counterparts in CS-modified gravity. Specific signatures appear in the electromagnetic spectrum, thus leading to the possibility of directly testing CS-modified gravity by using astrophysical observations of the emission spectra from accretion disks. © 2010 IOP Publishing Ltd.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/cqgen_HK
dc.relation.ispartofClassical and Quantum Gravityen_HK
dc.titleThin accretion disk signatures in dynamical Chern-Simons-modified gravityen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, TC:harko@hkucc.hku.hken_HK
dc.identifier.authorityHarko, TC=rp1333en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0264-9381/27/10/105010en_HK
dc.identifier.scopuseid_2-s2.0-77951562108en_HK
dc.identifier.hkuros242349-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77951562108&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume27en_HK
dc.identifier.issue10en_HK
dc.identifier.eissn1361-6382-
dc.identifier.isiWOS:000277041800011-
dc.relation.projectBrane world cosmology: post-inflationary reheating and gravitational lensing-

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