Early viscous universe with variable cosmological and gravitational constants in higher dimensional space time

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dc.authorid0000-0001-9673-8875en_US
dc.authorid0000-0003-0183-5539
dc.contributor.authorKhadekar, G. S.
dc.contributor.authorKondawar, Gopal L.
dc.contributor.authorKamdi, Vaishali
dc.contributor.authorÖzel, Cenap
dc.date.accessioned2021-06-23T19:21:00Z
dc.date.available2021-06-23T19:21:00Z
dc.date.issued2008
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Matematik Bölümüen_US
dc.description.abstractIn this paper we present a number of classes of solutions of the Einstein's field equations with variable G, Lambda and bulk viscosity for a Kaluza-Klein type of cosmological model. The solutions are obtained by using gamma-law equation of state p = (gamma - 1)rho, where adiabatic parameter gamma-varies continuously as the universe expand. A unified description of the early evolution of the universe is discussed with number of possible assumption on the bulk viscous term and gravitational constant in which an inflationary phase followed by radiation-dominated phase. We also investigate the cosmological model with constant and time dependent bulk viscosity along with constant and time dependent gravitational constant. In all cases, the cosmological constant Lambda found to be positive and decreasing function of time which supports the results obtained from recent supernovae Ia observations. The important physical behaviour of the early cosmological model has also been discussed in the frame work of higher dimensional space-time.en_US
dc.identifier.doi10.1007/s10773-008-9741-y
dc.identifier.endpage3074en_US
dc.identifier.issn0020-7748
dc.identifier.issn1572-9575
dc.identifier.issue11en_US
dc.identifier.scopus2-s2.0-53549114481en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage3057en_US
dc.identifier.urihttps://doi.org/10.1007/s10773-008-9741-y
dc.identifier.urihttps://hdl.handle.net/20.500.12491/6202
dc.identifier.volume47en_US
dc.identifier.wosWOS:000259862400027en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorÖzel, Cenap
dc.language.isoenen_US
dc.publisherSpringer Science+Business Media, LLC, part of Springer Natureen_US
dc.relation.ispartofInternational Journal Of Theoretical Physicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectEarly Universeen_US
dc.subjectGravitational and Cosmological Constantsen_US
dc.titleEarly viscous universe with variable cosmological and gravitational constants in higher dimensional space timeen_US
dc.typeArticleen_US

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