Abstract:
We study the g-essence model with Yukawa interactions
between a scalar field φ and a Dirac field ψ. For
the homogeneous, isotropic and flat Friedmann–Robertson–
Walker universe filled with the such g-essence, the exact
solution of the model is found. Moreover, we reconstruct
the corresponding scalar and fermionic potentials which describe
the coupled dynamics of the scalar and fermionic
fields. It is shown that some particular g-essence models
with Yukawa interactions correspond to the usual and generalized
Chaplygin gas unified models of dark energy and
dark matter. Also we present some scalar–fermionic Dirac–
Born–Infeld models corresponding g-essence models with
Yukawa interactions which again describe the unified dark
energy–dark matter system.
