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Article: Thin accretion disks in stationary axisymmetric wormhole spacetimes

TitleThin accretion disks in stationary axisymmetric wormhole spacetimes
Authors
KeywordsPhysics
Nuclear physics
Issue Date2009
PublisherAmerican Physical Society.
Citation
Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, v. 79, p. 064001 How to Cite?
AbstractIn this paper, we study the physical properties and the equilibrium thermal radiation emission characteristics of matter forming thin accretion disks in stationary axially symmetric wormhole spacetimes. The thin disk models are constructed by taking different values of the wormhole's angular velocity, and the time averaged energy flux, the disk temperature, and the emission spectra of the accretion disks are obtained. Comparing the mass accretion in a rotating wormhole geometry with the one of a Kerr black hole, we verify that the intensity of the flux emerging from the disk surface is greater for wormholes than for rotating black holes with the same geometrical mass and accretion rate. We also present the conversion efficiency of the accreting mass into radiation, and show that the rotating wormholes provide a much more efficient engine for the transformation of the accreting mass into radiation than the Kerr black holes. Therefore specific signatures appear in the electromagnetic spectrum of thin disks around rotating wormholes, thus leading to the possibility of distinguishing wormhole geometries by using astrophysical observations of the emission spectra from accretion disks. © 2009 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/59582
ISSN
2014 Impact Factor: 4.643
2015 SCImago Journal Rankings: 1.882
ISI Accession Number ID
Funding AgencyGrant Number
RGC grant of the government of the Hong Kong SAR
Hungarian Scientific Research Fund (OTKA)69036
Fundacao para a Ciencia e a Tecnologia (FCT)-PortugalSFRH/BPD/26269/2006
Funding Information:

The work of T. H. is supported by an RGC grant of the government of the Hong Kong SAR. Z. K. was supported by the Hungarian Scientific Research Fund (OTKA) Grant No. 69036. F. S. N. L. was partially funded by Fundacao para a Ciencia e a Tecnologia (FCT)-Portugal through the Grant No. SFRH/BPD/26269/2006.

 

DC FieldValueLanguage
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorKovacs, Zen_HK
dc.contributor.authorLobo, FSNen_HK
dc.date.accessioned2010-05-31T03:53:13Z-
dc.date.available2010-05-31T03:53:13Z-
dc.date.issued2009en_HK
dc.identifier.citationPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2009, v. 79, p. 064001en_HK
dc.identifier.issn1550-7998en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59582-
dc.description.abstractIn this paper, we study the physical properties and the equilibrium thermal radiation emission characteristics of matter forming thin accretion disks in stationary axially symmetric wormhole spacetimes. The thin disk models are constructed by taking different values of the wormhole's angular velocity, and the time averaged energy flux, the disk temperature, and the emission spectra of the accretion disks are obtained. Comparing the mass accretion in a rotating wormhole geometry with the one of a Kerr black hole, we verify that the intensity of the flux emerging from the disk surface is greater for wormholes than for rotating black holes with the same geometrical mass and accretion rate. We also present the conversion efficiency of the accreting mass into radiation, and show that the rotating wormholes provide a much more efficient engine for the transformation of the accreting mass into radiation than the Kerr black holes. Therefore specific signatures appear in the electromagnetic spectrum of thin disks around rotating wormholes, thus leading to the possibility of distinguishing wormhole geometries by using astrophysical observations of the emission spectra from accretion disks. © 2009 The American Physical Society.-
dc.languageengen_HK
dc.publisherAmerican Physical Society.en_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.en_HK
dc.subjectPhysics-
dc.subjectNuclear physics-
dc.titleThin accretion disks in stationary axisymmetric wormhole spacetimesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1550-7998&volume=79&spage=064001&epage=&date=2009&atitle=Thin+accretion+disks+in+stationary+axisymmetric+wormhole+spacetimesen_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.emailLobo, FSN: francisco.lobo@port.ac.uk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevD.79.064001-
dc.identifier.scopuseid_2-s2.0-63149112752-
dc.identifier.hkuros163434en_HK
dc.identifier.volume79-
dc.identifier.spage064001-
dc.identifier.isiWOS:000264762500048-

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