Parameterized Deceleration in $f(Q,C)$ Gravity: A Logarithmic Approach

Abstract

This study explores a distinctive logarithmic parameterization of the deceleration parameter within the $f(Q,C)$ gravity framework, incorporating a nonlinear functional form $f(Q,C)={\hat{I}}_1^3{Q}^n+{\hat{I}}_2^{3}C$, where $Q$ and $C$ denote the nonmetricity scalar and boundary term, respectively, and $n\ge 1$. This approach provides a unique perspective on the universe's accelerated expansion without resorting to exotic fields. Using observational data from Hubble measurements (OHD) and the Pantheon+SH0ES Type Ia supernovae dataset, the model parameters were constrained through a $\ddot{I}{‡}^2$ minimization technique. The analysis reveals a transition from deceleration to acceleration in the expansion history of the universe, with the transition redshifts $z_t\approx 0.98$ (OHD) and $z_t\approx 0.76$ (Pantheon+SH0ES). The model demonstrates consistency with observations, offering insights into the dynamics of dark energy and alternative gravity theories, while effectively modeling cosmic evolution across epochs.

18 pages, 10 figures, 2 tables