Observational constraints for an axially symmetric transitioning model with bulk viscosity parameterization

TL;DR

This paper investigates the role of bulk viscosity in an axially symmetric Bianchi type-I universe model, using observational data to constrain the model and analyze its implications for cosmic acceleration.

Contribution

It introduces four bulk viscosity parameterizations in an anisotropic cosmological model and constrains them with recent observational Hubble data.

Findings

Model aligns with observational data on cosmic expansion

Bulk viscosity influences universe's accelerated expansion

Statefinder diagnostics reveal distinctive evolutionary features

Abstract

In this paper, we have analyzed the significance of bulk viscosity in an axially symmetric Bianchi type-I model to study the accelerated expansion of the universe. We have considered four bulk viscosity parameterizations for the matter-dominated cosmological model. The function of the two significant Hubble $H(z)$ and deceleration parameters are discussed in detail. The energy parameters of the universe are computed using the most recent observational Hubble data (57 data points) in the redshift range $0.07 \leq z \leq 2.36)$. In this model, we obtained all feasible solutions with the viscous component and analyzed the universe's expansion history. Finally, we analyzed the statefinder diagnostic and found some interesting results. The outcomes of our developed model now properly align with observational results.