Exact solutions in a scalar-tensor model of dark energy

Abstract

We consider a model of scalar field with non minimal kinetic and Gauss Bonnet couplings as a source of dark energy. Based on asymptotic limits of the generalized Friedmann equation, we impose restrictions on the kinetic an Gauss-Bonnet couplings. This restrictions considerable simplify the equations, allowing for exact solutions unifying early time matter dominance with transitions to late time quintessence and phantom phases. The stability of the solutions in absence of matter has been studied.

30 pages, 2 figures, to appear in JCAP

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Cited by in corpus (4)

• Gauss-Bonnet dark energy by Lagrange multipliers
• Cosmology with non-minimal derivative couplings: perturbation analysis and observational constraints
• Cosmological models in modified gravity theories with extended nonminimal derivative couplings
• Quintessential and phantom power-law solutions in scalar tensor model of dark energy