Cosmological model in the framework of $f(R,{\mathcal{L}}_m)$ gravity with quadratic equation of state parameter

Abstract

In this study, we have explored a transitioning cosmological model of universe's expansion in $f(R,{\mathcal{L}}_m)$ gravity. The quadratic type of equation of state parameter in the form $\omega =-1+\alpha (1+z)+\beta (1+z{)}^2$, where $\alpha$ and $\beta$ are constants, is considered to determine the explicit solution of field equations and derive Hubble parameter in term of redshift $z$. The model parameters are estimated taking observational datasets of BAO, Pantheon, and CC using MCMC analysis. Some dynamical properties like EOS parameter, energy density, pressure, and deceleration parameter are described. The cosmographic parameter like statefinders ($r,s$), jerk parameter ($j$) etc are also thoroughly explained. The energy conditions are also examined to validate the viability of the proposed model. We observe a transition redshift at $z_t=0.942_{-0.164}^{+0.112}$ with the present value of deceleration parameter $q_0=-0.4815_{-0.0096}^{+0.0362}$.

23 pages, 15 figures. Accepted in Physics of Dark Universe (DARK-D-25-00109). arXiv admin note: text overlap with arXiv:2503.21243