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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todo:paper_02649381_v13_n7_p1727_Chimento2023-10-03T15:13:08Z Viscosity effects in (1 + 1)-dimensional cosmologies Chimento, L.P. Cossarini, A.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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02649381_v13_n7_p1727_Chimento |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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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. |
| format |
JOUR |
| author |
Chimento, L.P. Cossarini, A.E. |
| spellingShingle |
Chimento, L.P. Cossarini, A.E. Viscosity effects in (1 + 1)-dimensional cosmologies |
| author_facet |
Chimento, L.P. Cossarini, A.E. |
| author_sort |
Chimento, L.P. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_02649381_v13_n7_p1727_Chimento |
| work_keys_str_mv |
AT chimentolp viscosityeffectsin11dimensionalcosmologies AT cossariniae viscosityeffectsin11dimensionalcosmologies |
| _version_ |
1807322400075808768 |