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Article: Bianchi type I cosmologies in arbitrary dimensional dilaton gravities

TitleBianchi type I cosmologies in arbitrary dimensional dilaton gravities
Authors
KeywordsPhysics - nuclear physics
Issue Date2000
PublisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.org
Citation
Physical Review D (Particles and Fields), 2000, v. 62 n. 12, p. 124016:1-11 How to Cite?
AbstractWe study the low energy string effective action with an exponential type dilaton potential and vanishing torsion in a Bianchi type I space-time geometry. In the Einstein and string frames the general solution of the gravitational field equations can be expressed in an exact parametric form. Depending on the values of the dilaton coupling constant and of the coefficient in the exponential, the obtained cosmological models can be generically divided into three classes, leading to both singular and non-singular behaviors. The effect of the potential on the time evolution of the mean anisotropy parameter is also considered in detail, and it is shown that a Bianchi type I universe isotropizes only in the presence of a dilaton field potential or a central deficit charge.
Persistent Identifierhttp://hdl.handle.net/10722/43321
ISSN
2004 Impact Factor: 5.156
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, CMen_HK
dc.contributor.authorHarko, TCen_HK
dc.contributor.authorMak, MKen_HK
dc.date.accessioned2007-03-23T04:43:32Z-
dc.date.available2007-03-23T04:43:32Z-
dc.date.issued2000en_HK
dc.identifier.citationPhysical Review D (Particles and Fields), 2000, v. 62 n. 12, p. 124016:1-11en_HK
dc.identifier.issn0556-2821en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43321-
dc.description.abstractWe study the low energy string effective action with an exponential type dilaton potential and vanishing torsion in a Bianchi type I space-time geometry. In the Einstein and string frames the general solution of the gravitational field equations can be expressed in an exact parametric form. Depending on the values of the dilaton coupling constant and of the coefficient in the exponential, the obtained cosmological models can be generically divided into three classes, leading to both singular and non-singular behaviors. The effect of the potential on the time evolution of the mean anisotropy parameter is also considered in detail, and it is shown that a Bianchi type I universe isotropizes only in the presence of a dilaton field potential or a central deficit charge.en_HK
dc.format.extent128235 bytes-
dc.format.extent122136 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/pdf-
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.orgen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review D (Particles and Fields). Copyright © American Physical Society.en_HK
dc.subjectPhysics - nuclear physicsen_HK
dc.titleBianchi type I cosmologies in arbitrary dimensional dilaton gravitiesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0556-2821&volume=62&issue=12&spage=124016:1&epage=11&date=2000&atitle=Bianchi+type+I+cosmologies+in+arbitrary+dimensional+dilaton+gravitiesen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevD.62.124016en_HK
dc.identifier.hkuros63703-
dc.identifier.isiWOS:000166039900044-

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