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Article: Spectral shifts between massive and massless particles from cosmic sources

TitleSpectral shifts between massive and massless particles from cosmic sources
Authors
KeywordsElementary particles
Relativity
Galaxies: nuclei
Cosmology: theory
Issue Date1995
PublisherSpringer-Verlag. The Journal's web site is located at http://aa.springer.de/index.htm
Citation
Astronomy & Astrophysics, 1995, v. 300, p. 317-322 How to Cite?
AbstractStable neutral particles with non-zero mass, e.g. massive neutrinos, axions etc., may be produced in the vicinity of some powerful sources that are cosmological distance indicators, e.g. active galactic nuclei. Their spectral features will be altered due to the expansion of the Universe and possible beaming mechanisms. We use the geodesic equation of the Robertson-Walker metric and the Liouville theorem to describe the spectral shifts relative to massless particles, e.g. photons, due to these two effects. If these neutral particles and high energy photons are produced in a similar fashion, some vital information (e.g. distance to the source, mass of the neutral particles, velocity of the emitting source etc.) can be obtained by comparing the spectral shift between the massive particles and massless photons.
Persistent Identifierhttp://hdl.handle.net/10722/80455
ISSN
2014 Impact Factor: 4.378
2015 SCImago Journal Rankings: 2.446

 

DC FieldValueLanguage
dc.contributor.authorZhang, JLen_HK
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorLee, TMen_HK
dc.date.accessioned2010-09-06T08:06:38Z-
dc.date.available2010-09-06T08:06:38Z-
dc.date.issued1995en_HK
dc.identifier.citationAstronomy & Astrophysics, 1995, v. 300, p. 317-322en_HK
dc.identifier.issn0004-6361en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80455-
dc.description.abstractStable neutral particles with non-zero mass, e.g. massive neutrinos, axions etc., may be produced in the vicinity of some powerful sources that are cosmological distance indicators, e.g. active galactic nuclei. Their spectral features will be altered due to the expansion of the Universe and possible beaming mechanisms. We use the geodesic equation of the Robertson-Walker metric and the Liouville theorem to describe the spectral shifts relative to massless particles, e.g. photons, due to these two effects. If these neutral particles and high energy photons are produced in a similar fashion, some vital information (e.g. distance to the source, mass of the neutral particles, velocity of the emitting source etc.) can be obtained by comparing the spectral shift between the massive particles and massless photons.-
dc.languageengen_HK
dc.publisherSpringer-Verlag. The Journal's web site is located at http://aa.springer.de/index.htmen_HK
dc.relation.ispartofAstronomy & Astrophysicsen_HK
dc.subjectElementary particles-
dc.subjectRelativity-
dc.subjectGalaxies: nuclei-
dc.subjectCosmology: theory-
dc.titleSpectral shifts between massive and massless particles from cosmic sourcesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1687-0980&volume=300&spage=317&epage=322&date=1995&atitle=Spectral+shifts+between+massive+particles+and+massless+particles+from+cosmic+sourcesen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.identifier.hkuros20480en_HK
dc.identifier.hkuros9252-
dc.identifier.volume300-
dc.identifier.spage317-
dc.identifier.epage322-
dc.publisher.placeFrance-

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