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.
