Constraints on the Parameterized Deceleration Parameter in FLRW Universe

TL;DR

This paper reconstructs dark energy through parametrization of the deceleration parameter in the FLRW universe, analyzing observational data to evaluate different models' viability and introducing a new parametrization approach.

Contribution

It introduces a new model for the deceleration parameter and compares multiple parametrizations using observational data and information criteria.

Findings

Model 4 shows promising viability based on data analysis.

Different parametrizations yield consistent cosmological parameter estimates.

The new model provides an alternative perspective on dark energy evolution.

Abstract

Confirmation of accelerated expansion of the universe probed the concept of dark energy theory, and since then, numerous models have been introduced to explain its origin and nature. The present work is based on reconstructing dark energy by parametrization of the deceleration parameter in the FRW universe filled with radiation, dark matter, and dark energy. We have chosen some well-motivated parametrized models 1-3 in an attempt to investigate the energy density in terms of deceleration parameters by estimating the cosmological parameters with the help of different observational datasets. Also, we have introduced a new model 4 for the parametrization of the deceleration parameter. Then we analyzed the cosmography parameters using the best-fit values of the parameters. Using the information criteria, we have examined the viability of the models.