A phantom dark energy model without a ghost field

Abstract

In this paper, we investigate geometrically the late-time cosmic acceleration in the presence of pressureless matter and when the universe is devoid of matter. The expansion of the universe undergoes an acceleration due to the modification of Riemann manifold and could even evolve into a phantom regime without considering a ghost field. This phantom stage is explained in terms of generalized fluids with inhomogeneous modifications. Cosmological parameters found in this paper are roughly compatible with latest results based on astrophysical data. We also derive the corresponding [Formula: see text]-gravity.