Gravitationally induced particle creation in cubic gravity

Abstract

In this work, we consider gravitationally induced particle creation scenario to discuss the validity of thermodynamic laws in the context of cubic gravity which is based on an invariant term and constructed from cubic contraction of the Riemann tensor. We consider spatially flat FRW universe filled with a perfect fluid assuming an equation of state [Formula: see text] with [Formula: see text]. By taking the Hubble horizon as the boundary of the universe, we investigate the first and generalized second law of thermodynamics along with thermodynamic equilibrium in the presence of Bekenstein entropy. In order to view the clear picture of these laws, we take into account two models of particle creation rate [Formula: see text] which are constrained with recent observational data. It is found that the validity of these laws holds for the suitable values of model parameters in the specific ranges of redshift parameter for both models.