File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Time delay of photons of different energies in multidimensional cosmological models

TitleTime delay of photons of different energies in multidimensional cosmological models
Authors
KeywordsCosmology: theory
Gamma rays: bursts
Radiation mechanisms: general
Issue Date2004
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2004, v. 611 n. 2 I, p. 633-641 How to Cite?
AbstractWe consider the general expressions for the time delay of photons of different energies in the framework of multidimensional cosmological models. In models with compactified extra dimensions (Kaluza-Klein-type models), the main source of the photon time delay is the time variation of the electromagnetic coupling due to dimensional reduction, which induces an energy dependence of the speed of light. A similar relation between the fine-structure constant and the multidimensional gauge couplings also appears in models with large (non-compactified) extra dimensions. For photons of energies around 1 TeV propagating at cosmological distances in an expanding universe, the time delay could range from a few seconds in the case of Kaluza-Klein models to a few days for models with large extra dimensions. As a consequence of the multidimensional effects, the intrinsic time profiles at the emitter rest frame differ from the detected time profiles. The formalism developed in the present paper allows the transformation of the predicted light curves of various energy ranges of the emitter into the frame of the observer for comparison with observations. Therefore, the study of the energy and redshift dependence of the time delay of photons emitted by astrophysical sources at cosmological distances could discriminate between the different multidimensional models and/or quantum gravity effects.
Persistent Identifierhttp://hdl.handle.net/10722/43450
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2007-03-23T04:45:56Z-
dc.date.available2007-03-23T04:45:56Z-
dc.date.issued2004en_HK
dc.identifier.citationAstrophysical Journal Letters, 2004, v. 611 n. 2 I, p. 633-641en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43450-
dc.description.abstractWe consider the general expressions for the time delay of photons of different energies in the framework of multidimensional cosmological models. In models with compactified extra dimensions (Kaluza-Klein-type models), the main source of the photon time delay is the time variation of the electromagnetic coupling due to dimensional reduction, which induces an energy dependence of the speed of light. A similar relation between the fine-structure constant and the multidimensional gauge couplings also appears in models with large (non-compactified) extra dimensions. For photons of energies around 1 TeV propagating at cosmological distances in an expanding universe, the time delay could range from a few seconds in the case of Kaluza-Klein models to a few days for models with large extra dimensions. As a consequence of the multidimensional effects, the intrinsic time profiles at the emitter rest frame differ from the detected time profiles. The formalism developed in the present paper allows the transformation of the predicted light curves of various energy ranges of the emitter into the frame of the observer for comparison with observations. Therefore, the study of the energy and redshift dependence of the time delay of photons emitted by astrophysical sources at cosmological distances could discriminate between the different multidimensional models and/or quantum gravity effects.en_HK
dc.format.extent206445 bytes-
dc.format.extent122136 bytes-
dc.format.extent12158 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectCosmology: theoryen_HK
dc.subjectGamma rays: burstsen_HK
dc.subjectRadiation mechanisms: generalen_HK
dc.titleTime delay of photons of different energies in multidimensional cosmological modelsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=611&issue=2 pt 1&spage=633&epage=641&date=2004&atitle=Time+Delay+of+Photons+of+Different+Energies+in+Multidimensional+Cosmological+Modelsen_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityHarko, T=rp01333en_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/422378en_HK
dc.identifier.scopuseid_2-s2.0-6044229883en_HK
dc.identifier.hkuros97122-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-6044229883&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume611en_HK
dc.identifier.issue2 Ien_HK
dc.identifier.spage633en_HK
dc.identifier.epage641en_HK
dc.identifier.isiWOS:000223403400002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHarko, T=7006485783en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats