Cosmology of f-essence with inhomogeneous viscous fluid

Abstract

F-essence is a generalized form of fermion fields. In this paper, we study the dynamics of f-essence with a viscous fluid in the flat Friedmann-Robertson-Walker universe. Various types of viscous fluids are analyzed and the possibility of reproducing the current accelerating expansion of the Universe is investigated. The cosmological parameters of this model are determined. It is shown that accelerated expansion can also be obtained with a viscous fluid of the fermion field, as in the case of non-interacting perfect fluid considered in most modern models of accelerated expansion of the Universe.