Mimicking the $\Lambda$CDM Universe through inhomogeneous space-time

TL;DR

This paper presents an inhomogeneous universe model that replicates the accelerated expansion of the universe typically attributed to dark energy, aligning closely with observational data and mimicking the standard b5bcdm model.

Contribution

It introduces a novel inhomogeneous space-time model that reproduces b5bcdm-like acceleration without dark energy, validated against multiple observational datasets.

Findings

Model closely mimics b5bcdm cosmology

Inhomogeneity acts as curvature in the model

Consistent with supernova, H0, and BAO data

Abstract

Starting from an inhomogeneous space-time model of the universe we could recreate a scenario of recent time accelerating universe dominated by Dark Energy type of fluid. The background matter component of such a universe was considered to be made up of a combination of an anisotropic fluid, a barotropic fluid and the presureless cold dark matter. It was found that inhomogeneity exhibits itself as the curvature term in such a universe. We corroborated our model with recent supernova Ia-JLA data together with $H_{0}$ data and BAO data. Cosmographic analysis of the dynamical variables further show that the model can mimic the $\Lambda$CDM cosmology very closely.