G-essence with Yukawa Interactions

Understand

We study the g-essence model with Yukawa interactions between a scalar field $\phi$ and a Dirac field $\psi$.

• 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.