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Article: Causal bulk viscous dissipative isotropic cosmologies with variable gravitational and cosmological constants

TitleCausal bulk viscous dissipative isotropic cosmologies with variable gravitational and cosmological constants
Authors
Issue Date2002
PublisherWorld Scientific Publishing Co Pte Ltd. The Journal's web site is located at http://www.worldscinet.com/ijmpd/ijmpd.shtml
Citation
International Journal of Modern Physics D, 2002, v. 11 n. 8, p. 1265-1283 How to Cite?
AbstractWe consider the evolution of a flat Friedmann-Robertson-Walker Universe, filled with a causal bulk viscous cosmological fluid, in the presence of variable gravitational and cosmological constants. The basic equation for the Hubble parameter, generalizing the evolution equation in the case of constant gravitational coupling and cosmological term is derived, under the supplementary assumption that the total energy of the Universe is conserved. By assuming that the cosmological constant is proportional to the square of the Hubble parameter and a power law dependence of the bulk viscosity coefficient, temperature and relaxation time on the energy density of the cosmological fluid, two classes of exact solutions of the field equations are obtained. In the first class of solutions the Universe ends in an inflationary era, while in the second class of solutions the expansion of the Universe is noninflationary for all times. In both models the cosmological "constant" is a decreasing function of time, while the gravitational "constant" increases in the early period of evolution of the Universe and tends in the large time limit to a constant value.
Persistent Identifierhttp://hdl.handle.net/10722/91773
ISSN
2015 Impact Factor: 1.963
2015 SCImago Journal Rankings: 0.718
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMak, MKen_HK
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorBelinchón, JAen_HK
dc.date.accessioned2010-09-17T10:26:12Z-
dc.date.available2010-09-17T10:26:12Z-
dc.date.issued2002en_HK
dc.identifier.citationInternational Journal of Modern Physics D, 2002, v. 11 n. 8, p. 1265-1283en_HK
dc.identifier.issn0218-2718en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91773-
dc.description.abstractWe consider the evolution of a flat Friedmann-Robertson-Walker Universe, filled with a causal bulk viscous cosmological fluid, in the presence of variable gravitational and cosmological constants. The basic equation for the Hubble parameter, generalizing the evolution equation in the case of constant gravitational coupling and cosmological term is derived, under the supplementary assumption that the total energy of the Universe is conserved. By assuming that the cosmological constant is proportional to the square of the Hubble parameter and a power law dependence of the bulk viscosity coefficient, temperature and relaxation time on the energy density of the cosmological fluid, two classes of exact solutions of the field equations are obtained. In the first class of solutions the Universe ends in an inflationary era, while in the second class of solutions the expansion of the Universe is noninflationary for all times. In both models the cosmological "constant" is a decreasing function of time, while the gravitational "constant" increases in the early period of evolution of the Universe and tends in the large time limit to a constant value.en_HK
dc.languageengen_HK
dc.publisherWorld Scientific Publishing Co Pte Ltd. The Journal's web site is located at http://www.worldscinet.com/ijmpd/ijmpd.shtmlen_HK
dc.relation.ispartofInternational Journal of Modern Physics Den_HK
dc.titleCausal bulk viscous dissipative isotropic cosmologies with variable gravitational and cosmological constantsen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, TC:harko@hkucc.hku.hken_HK
dc.identifier.authorityHarko, TC=rp1333en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1142/S0218271802002232en_HK
dc.identifier.scopuseid_2-s2.0-0036759248en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036759248&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume11en_HK
dc.identifier.issue8en_HK
dc.identifier.spage1265en_HK
dc.identifier.epage1283en_HK
dc.identifier.isiWOS:000178842700011-

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