Phase space analysis for a scalar-tensor model with kinetic and Gauss-Bonnet couplings

Understand

We study the phase space for an scalar-tensor string inspired model of dark energy with non minimal kinetic and Gauss Bonnet couplings.

• The form of the scalar potential and of the coupling terms is of the exponential type, which give rise to appealing cosmological solutions.
• The critical points describe a variety of cosmological scenarios that go from matter or radiation dominated universe to dark energy dominated universe.
• There were found trajectories in the phase space departing from unstable or saddle fixed points and arriving to the stable scalar field dominated point corresponding to late-time accelerated expansion.