Governing accelerating Universe via newly reconstructed Hubble parameter by employing empirical data simulations

TL;DR

This paper introduces a new parametrization of the Hubble parameter and uses extensive observational data to analyze the universe's acceleration, comparing models with statistical criteria and exploring the Dainotti relation.

Contribution

It proposes a novel Hubble parameter parametrization and employs comprehensive data analysis to constrain cosmological models and assess their performance.

Findings

Universe is currently accelerating in its expansion.

Models indicate a quintessence phase of dark energy.

Statistical criteria favor certain models over others.

Abstract

A new parametrization of the Hubble parameter is proposed to explore the issue of the cosmological landscape. The constraints on model parameters are derived through the Markov Chain Monte Carlo (MCMC) method by employing a comprehensive union of datasets such as 34 data points from cosmic chronometers (CC), 42 points from baryonic acoustic oscillations (BAO), a recently updated set of 1701 Pantheon$^+$ (P22) data points derived from Type Ia supernovae (SNeIa), and 162 data points from gamma-ray bursts (GRBs). Furthermore, the models are compared by using the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC), so that a comparative assessment of model performance can be available. Additionally, we compare the Dainotti relation via Gaussian likelihood analysis versus new likelihoods and Calibration of the Dainotti relation through a model-independent method. The kinematic behavior of the models is also investigated by encompassing the transition from deceleration to acceleration and the evolution of the jerk parameter. From the analysis of the parametric models, it is strongly indicated that the Universe is currently undergoing an accelerated phase with diagnostics of the model validating the quintessence phase.