Viscous Accelerating Universe with Non-linear and Logarithmic Equation of State Fluid
| Autor: | Andrey N. Makarenko, A. V. Timoshkin, Iver Brevik |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) Logarithm Equation of state (cosmology) media_common.quotation_subject Isotropy FOS: Physical sciences Volume viscosity General Relativity and Quantum Cosmology (gr-qc) Universe General Relativity and Quantum Cosmology Nonlinear system Classical mechanics Dark energy media_common Accelerating universe |
| DOI: | 10.48550/arxiv.1907.02280 |
| Popis: | We describe the accelerated expansion of the late-time universe using a generalized equation of state (EoS) when account is taken of bulk viscosity. We assume a homogeneous and isotropic Friedmann-Robertson-Walker spacetime. Solutions of the gravitational equations for dark energy are obtained in implicit form. Characteristic properties of the Universe evolution in the presence of the viscosity effects are discussed. Finally, the dynamics of the accelerated expansion of the viscous universe is discussed, on the basis of a modified logarithmic-corrected EoS. Comment: 12 pages, no figures; to appear in Int. J. of Geometric Methods in Modern Physics |
| Databáze: | OpenAIRE |
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