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Article: Electromagnetic signatures of thin accretion disks in wormhole geometries

TitleElectromagnetic signatures of thin accretion disks in wormhole geometries
Authors
KeywordsPhysics
Nuclear physics
Issue Date2008
PublisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.org
Citation
Physical Review D: Particles, Fields, Gravitation and Cosmology, 2008, v. 78 n. 8 article no. 084005 How to Cite?
AbstractIn this paper, we study the physical properties and characteristics of matter forming thin accretion disks in static and spherically symmetric wormhole spacetimes. In particular, the time averaged energy flux, the disk temperature, and the emission spectra of the accretion disks are obtained for these exotic geometries and are compared with the Schwarzschild solution. It is shown that more energy is emitted from the disk in a wormhole geometry than in the case of the Schwarzschild potential and the conversion efficiency of the accreted mass into radiation is more than a factor of 2 higher for the wormholes than for static black holes. These effects in the disk radiation are confirmed in the radial profiles of temperature corresponding to theses flux distributions, and in the emission spectrum ωL(ω) of the accretion disks. We conclude that specific signatures appear in the electromagnetic spectrum, thus leading to the possibility of distinguishing wormhole geometries by using astrophysical observations of the emission spectra from accretion disks.
Persistent Identifierhttp://hdl.handle.net/10722/123960
ISSN
2014 Impact Factor: 4.643
2015 SCImago Journal Rankings: 1.882
ISI Accession Number ID
Funding AgencyGrant Number
Hungarian Scientific Research Fund (OTKA)69036
Fundacao para a Ciencia e a Tecnologia (FCT) - Portugal tSFRH/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 funded by Fundacao para a Ciencia e a Tecnologia (FCT) - Portugal through the Grant No. SFRH/BPD/26269/2006.

 

DC FieldValueLanguage
dc.contributor.authorHarko, T-
dc.contributor.authorKovács, Z-
dc.contributor.authorLobo, FSN-
dc.date.accessioned2010-10-13T04:21:36Z-
dc.date.available2010-10-13T04:21:36Z-
dc.date.issued2008-
dc.identifier.citationPhysical Review D: Particles, Fields, Gravitation and Cosmology, 2008, v. 78 n. 8 article no. 084005-
dc.identifier.issn1550-7998-
dc.identifier.urihttp://hdl.handle.net/10722/123960-
dc.description.abstractIn this paper, we study the physical properties and characteristics of matter forming thin accretion disks in static and spherically symmetric wormhole spacetimes. In particular, the time averaged energy flux, the disk temperature, and the emission spectra of the accretion disks are obtained for these exotic geometries and are compared with the Schwarzschild solution. It is shown that more energy is emitted from the disk in a wormhole geometry than in the case of the Schwarzschild potential and the conversion efficiency of the accreted mass into radiation is more than a factor of 2 higher for the wormholes than for static black holes. These effects in the disk radiation are confirmed in the radial profiles of temperature corresponding to theses flux distributions, and in the emission spectrum ωL(ω) of the accretion disks. We conclude that specific signatures appear in the electromagnetic spectrum, thus leading to the possibility of distinguishing wormhole geometries by using astrophysical observations of the emission spectra from accretion disks.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.org-
dc.relation.ispartofPhysical Review D: Particles, Fields, Gravitation and Cosmology-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.rightsPhysical Review D: Particles, Fields, Gravitation and Cosmology. Copyright © American Physical Society.-
dc.subjectPhysics-
dc.subjectNuclear physics-
dc.titleElectromagnetic signatures of thin accretion disks in wormhole geometriesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1550-7998&volume=78&issue=8 article no. 084005&spage=&epage=&date=2008&atitle=Electromagnetic+signatures+of+thin+accretion+disks+in+wormhole+geometries-
dc.identifier.emailHarko, T: harko@hkucc.hku.hk-
dc.identifier.emailKovács, Z: zkovacs@mpifr-bonn.mpg.de-
dc.identifier.emailLobo, FSN: francisco.lobo@port.ac.uk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevD.78.084005-
dc.identifier.scopuseid_2-s2.0-54249152921-
dc.identifier.hkuros163431-
dc.identifier.volume78-
dc.identifier.issue8 article no. 084005-
dc.identifier.isiWOS:000260574900067-

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