Cosmological Bounce Scenario with a Novel Parametrization of Bulk Viscosity
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| Format: | Preprint |
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2024
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| _version_ | 1866910536844705792 |
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| author | Mazumdar, Rajdeep Gohain, Mrinnoy M. Bhuyan, Kalyan |
| author_facet | Mazumdar, Rajdeep Gohain, Mrinnoy M. Bhuyan, Kalyan |
| contents | In this work, we have studied how incorporating viscous fluids leads to exact bounce cosmological solutions in general relativity (GR) framework. Specifically, we propose a novel parameterization of bulk viscosity coefficient of the form $ζ= ζ_0 (t-t_0)^{-2n} H$, where $ζ_0$, $n$ being some positive constants and $t_0$ is the bounce epoch. We investigate how this form of bulk viscosity may assist in explaining the early universe's behaviour, with a particular focus on non-singular bounce scenario by studying the various energy conditions and other related cosmological observables and how the model parameters affect the evolution of the Universe. We demonstrate that the NEC and SEC violation occurs at the bounce point while DEC is satisfied. Finally, we carried out a stability check based on linear order perturbation to the Hubble parameter. We found that the perturbation vanishes asymptotically at later times, which indicates a stable behaviour of the bounce scenario |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_15178 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Cosmological Bounce Scenario with a Novel Parametrization of Bulk Viscosity Mazumdar, Rajdeep Gohain, Mrinnoy M. Bhuyan, Kalyan General Relativity and Quantum Cosmology In this work, we have studied how incorporating viscous fluids leads to exact bounce cosmological solutions in general relativity (GR) framework. Specifically, we propose a novel parameterization of bulk viscosity coefficient of the form $ζ= ζ_0 (t-t_0)^{-2n} H$, where $ζ_0$, $n$ being some positive constants and $t_0$ is the bounce epoch. We investigate how this form of bulk viscosity may assist in explaining the early universe's behaviour, with a particular focus on non-singular bounce scenario by studying the various energy conditions and other related cosmological observables and how the model parameters affect the evolution of the Universe. We demonstrate that the NEC and SEC violation occurs at the bounce point while DEC is satisfied. Finally, we carried out a stability check based on linear order perturbation to the Hubble parameter. We found that the perturbation vanishes asymptotically at later times, which indicates a stable behaviour of the bounce scenario |
| title | Cosmological Bounce Scenario with a Novel Parametrization of Bulk Viscosity |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2407.15178 |