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| DOI | 10.1007/S10714-020-02712-Z | ||||
| Año | 2020 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
In this article we report a novel analytic solution describing a cosmological model with a matter content represented by a one dissipative fluid component, in the framework of the causal Israel-Stewart theory. The dissipative fluid is described by a barotropic equation of state p = (gamma - 1)rho and the bulk viscosity has been assumed of the form xi = xi 0 rho(s). We study within the parameter space which label the solution, a suited region compatible with an accelerated expansion of the universe for late times, as well as stability properties of the solution at the critical parameter value gamma = 1 and for s = 1/2. We study as well the consequences that arise from the positiveness of the entropy production along the time evolution. We found that the solution for pressureless dark matter, gamma = 1, can well describe a universe with a transition from a decelerated expansion to an accelerated one at late times, but with a very large non-adiabatic contribution to speed of sound. Finally, the kinematics and thermodynamics properties of the solutions are discussed in terms of the type of expansion and entropy production.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Cruz, Norman | Hombre |
Universidad de Santiago de Chile - Chile
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| 2 | GONZALEZ-BANDA, ESTEBAN ANDRES | Hombre |
Universidad de Santiago de Chile - Chile
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| 3 | Palma, Guillermo | Hombre |
Universidad de Santiago de Chile - Chile
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| Fuente |
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| CONICYT-PCHA |
| Universidad de Santiago de Chile |
| CONICYT-PCHA/Doctorado |
| Proyecto POSTDOC_DICYT |
| DOCTORADO |
| DICYT from Universidad de Santiago de Chile |
| Agradecimiento |
|---|
| This article was partially supported by Dicyt from Universidad de Santiago de Chile, through Grants No. 041831PA (G.P.) and No. 041831CM (N.C.). E.G. was supported by Proyecto POSTDOC_DICYT, codigo 041931CM_POSTDOC and partially supported by CONICYT-PCHA/Doctorado Nacional/2016-21160331. |
| This article was partially supported by Dicyt from Universidad de Santiago de Chile, through Grants No. 041831PA (G.P.) and No. 041831CM (N.C.). E.G. was supported by Proyecto POSTDOC_DICYT, código 041931CM_POSTDOC and partially supported by CONICYT-PCHA/Doctorado Nacional/2016-21160331. |