Probing Dark Energy Properties in $f Q,C)$ Gravity with FLRW Cosmological Models

TL;DR

This paper investigates the $f(Q,C)$ modified gravity model within FLRW cosmology, constraining its parameters with observational data to explore its viability as an alternative explanation for dark energy and cosmic acceleration.

Contribution

It introduces a parametric form of the Hubble parameter in $f(Q,C)$ gravity and constrains it using observational data, providing new insights into dark energy properties.

Findings

Model successfully explains accelerated expansion.

Constraints align with observational data.

Physical viability confirmed through energy conditions.

Abstract

This study delves into the cosmological implications of the $f(Q,C)$ modified gravity framework within the context of the FLRW spacetime which offers a dynamic alternative to the standard $\Lambda$CDM cosmology. Here, we define the transit form of Hubble's parameter to explain several geometrical and physical aspects. The chosen parametric form of the Hubble parameter represents a smooth transition from the decelerating early universe to the accelerating present and late-time evolution. Employing observational datasets such as the Hubble parameter, Type Ia supernovae, Baryon Acoustic Oscillations (BAO), and Standard Candles (SC), we constrain the model parameters using the Markov Chain Monte Carlo (MCMC) method. The isotropic pressure, energy density, equation of state parameter, and energy conditions were analyzed to explore the physical viability of the $f(Q,C)$ framework. The results highlight the model's ability to replicate key cosmological behaviors, including the accelerated expansion driven by dark energy.