Viscosity effects in (1 + 1)-dimensional cosmologies

We investigate the behaviour of the solutions to the gravitational (1 + 1)-dimensional equations with a viscous fluid source in the case of a Robertson-Walker metric. In our model the bulk viscosity coefficient is related to the energy density as ξ = αρm and we also take into account the effects of...

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Autores principales: Chimento, Luis Pascual, Cossarini, Adriana E.
Publicado: 1996
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02649381_v13_n7_p1727_Chimento
http://hdl.handle.net/20.500.12110/paper_02649381_v13_n7_p1727_Chimento
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02649381_v13_n7_p1727_Chimento
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spelling paper:paper_02649381_v13_n7_p1727_Chimento2023-06-08T15:23:19Z Viscosity effects in (1 + 1)-dimensional cosmologies Chimento, Luis Pascual Cossarini, Adriana E. We investigate the behaviour of the solutions to the gravitational (1 + 1)-dimensional equations with a viscous fluid source in the case of a Robertson-Walker metric. In our model the bulk viscosity coefficient is related to the energy density as ξ = αρm and we also take into account the effects of a nonlinear viscosity β. We find exact solutions of the field equations for several physically interesting cases which include Friedmann cosmologies and the time reversal of Murphy's class of cosmological solutions. We find that the global effect of bulk viscosity is to decrease the expansion rate while the nonlinear viscosity does not qualitatively change the models. On the other hand, the bulk viscosity is able to remove the initial singularities which are present in the corresponding viscosity free models as in the four-dimensional case. © 1996 IOP Publishing Ltd. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cossarini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1996 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02649381_v13_n7_p1727_Chimento http://hdl.handle.net/20.500.12110/paper_02649381_v13_n7_p1727_Chimento
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We investigate the behaviour of the solutions to the gravitational (1 + 1)-dimensional equations with a viscous fluid source in the case of a Robertson-Walker metric. In our model the bulk viscosity coefficient is related to the energy density as ξ = αρm and we also take into account the effects of a nonlinear viscosity β. We find exact solutions of the field equations for several physically interesting cases which include Friedmann cosmologies and the time reversal of Murphy's class of cosmological solutions. We find that the global effect of bulk viscosity is to decrease the expansion rate while the nonlinear viscosity does not qualitatively change the models. On the other hand, the bulk viscosity is able to remove the initial singularities which are present in the corresponding viscosity free models as in the four-dimensional case. © 1996 IOP Publishing Ltd.
author Chimento, Luis Pascual
Cossarini, Adriana E.
spellingShingle Chimento, Luis Pascual
Cossarini, Adriana E.
Viscosity effects in (1 + 1)-dimensional cosmologies
author_facet Chimento, Luis Pascual
Cossarini, Adriana E.
author_sort Chimento, Luis Pascual
title Viscosity effects in (1 + 1)-dimensional cosmologies
title_short Viscosity effects in (1 + 1)-dimensional cosmologies
title_full Viscosity effects in (1 + 1)-dimensional cosmologies
title_fullStr Viscosity effects in (1 + 1)-dimensional cosmologies
title_full_unstemmed Viscosity effects in (1 + 1)-dimensional cosmologies
title_sort viscosity effects in (1 + 1)-dimensional cosmologies
publishDate 1996
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02649381_v13_n7_p1727_Chimento
http://hdl.handle.net/20.500.12110/paper_02649381_v13_n7_p1727_Chimento
work_keys_str_mv AT chimentoluispascual viscosityeffectsin11dimensionalcosmologies
AT cossariniadrianae viscosityeffectsin11dimensionalcosmologies
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