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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2307.05576 |
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| _version_ | 1866913466145570816 |
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| author | Sasidharan, Athira Mathew, Titus K |
| author_facet | Sasidharan, Athira Mathew, Titus K |
| contents | In this paper we consider dissipative effects in $Λ$CDM model, i.e., we consider a universe with cosmological constant having viscous matter. We assume the most general form for bulk viscous coefficient, $ζ=ζ_{0}+ζ_{1}\frac{\dot{a}}{a}+ζ_{2}\frac{\ddot{a}}{\dot{a}}$ and obtained various constrains for $ζ$'s . We also studied the background study of the model with $ζ=ζ_{0}$ and $ζ=ζ_{1}\frac{\dot{a}}{a}$. Extracted the value of $ζ_1$ using the Pantheon data and also obtained its thermodynamic evolution and the age. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_05576 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Constraining the bulk viscous coefficients in a viscous universe with cosmological constant Sasidharan, Athira Mathew, Titus K General Relativity and Quantum Cosmology In this paper we consider dissipative effects in $Λ$CDM model, i.e., we consider a universe with cosmological constant having viscous matter. We assume the most general form for bulk viscous coefficient, $ζ=ζ_{0}+ζ_{1}\frac{\dot{a}}{a}+ζ_{2}\frac{\ddot{a}}{\dot{a}}$ and obtained various constrains for $ζ$'s . We also studied the background study of the model with $ζ=ζ_{0}$ and $ζ=ζ_{1}\frac{\dot{a}}{a}$. Extracted the value of $ζ_1$ using the Pantheon data and also obtained its thermodynamic evolution and the age. |
| title | Constraining the bulk viscous coefficients in a viscous universe with cosmological constant |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2307.05576 |