Viscous cosmological fluids and large-scale structure

Autor:	Mbewe, BG, Mekuria, RR, Sahlu, S, Abebe, A
Rok vydání:	2024
Předmět:	General Relativity and Quantum Cosmology
Zdroj:	SAIP2023 Proceedings
Druh dokumentu:	Working Paper
Popis:	In this paper, we study the viscous fluid cosmological model that when certain conditions are invoked mimics the $\Lambda$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. Comment: Published in SAIP2023 Proceedings, South African Institute of Physics
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2412.02276 Zobrazit plný text záznamu View this record from Arxiv