Exploring Universe acceleration through observational constraints via Hubble parameter reconstruction

Abstract

In this article, we introduce an innovative parametric representation of the Hubble parameter, providing a model-independent means to explore the dynamics of an accelerating cosmos. The model's parameters are rigorously constrained through a Markov Chain Monte Carlo (MCMC) approach, leveraging a comprehensive dataset consisting of 31 data points from cosmic chronometers (CC), 1701 updated observations of Pantheon supernovae type Ia (SNeIa), and 6 data points from baryonic acoustic oscillations (BAO). Our analysis delves into the behavior of various cosmological parameters within the model, including the transition from a decelerating phase to an accelerating one, as well as the density parameters and the equation of state (EoS) parameter. The outcomes of our investigation reveal that the equation of state parameter aligns with characteristics reminiscent of the phantom model, supporting the prevailing understanding of our universe's current state of acceleration. This research contributes valuable insights into the ongoing cosmic expansion and underscores the utility of our novel parametric approach.

Journal of High Energy Astrophysics accepted version

References in corpus (11)

• Modified teleparallel gravity: inflation without inflaton
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• WMAP constraints on low redshift evolution of dark energy
• Observational constraints on $f(T)$ theory
• Three thermodynamically-based parametrizations of the deceleration parameter
• Observational constraints on two cosmological models of $f(Q)$ theory
• Constrained evolution of effective equation of state parameter in non-linear $f(R,L_m)$ dark energy model: Insights from Bayesian analysis of cosmic chronometers and Pantheon samples
• Constraining the $f(R,T)=R+2\lambda T$ cosmological model using recent observational data
• Reconstruction of interaction rate in Holographic dark energy model with Hubble horizon as the infrared cut-off
• A comprehensive parametrization approach for the Hubble parameter in scalar field dark energy models
• The Standard Model Coupled to Quantum Gravitodynamics