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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2412.02276 |
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| _version_ | 1866929618065293312 |
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| author | Mbewe, BG Mekuria, RR Sahlu, S Abebe, A |
| author_facet | Mbewe, BG Mekuria, RR Sahlu, S Abebe, A |
| contents | In this paper, we study the viscous fluid cosmological model that when certain conditions are invoked mimics the $Λ$CDM model. The background equations governing the evolution of viscous interacting fluids in a multifluid system are derived. The Markov Chain Monte Carlo (MCMC) simulation is applied to constrain the best-fit cosmological parameters with Supernova Type 1a data. In addition, linear cosmological perturbations are investigated in a dust-matter-dominated frame using a $1+3$ covariant formalism approach. It is evident from the perturbation results obtained that the model predicts the disintegration of bound structures of large-scale structures in the late-time universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_02276 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Viscous cosmological fluids and large-scale structure Mbewe, BG Mekuria, RR Sahlu, S Abebe, A General Relativity and Quantum Cosmology In this paper, we study the viscous fluid cosmological model that when certain conditions are invoked mimics the $Λ$CDM model. The background equations governing the evolution of viscous interacting fluids in a multifluid system are derived. The Markov Chain Monte Carlo (MCMC) simulation is applied to constrain the best-fit cosmological parameters with Supernova Type 1a data. In addition, linear cosmological perturbations are investigated in a dust-matter-dominated frame using a $1+3$ covariant formalism approach. It is evident from the perturbation results obtained that the model predicts the disintegration of bound structures of large-scale structures in the late-time universe. |
| title | Viscous cosmological fluids and large-scale structure |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2412.02276 |