A simple parametrisation for coupled dark energy

Understand

As an alternative to the popular parametrisations of the dark energy equation of state, we construct a quintessence model where the scalar field has a linear dependence on the number of e-folds.

• Constraints on more complex models are typically limited by the degeneracies that increase with the number of parameters.
• The proposed parametrisation conveniently constrains the evolution of the dark energy equation of state as it allows for a wide variety of time evolutions.
• We also consider a non-minimal coupling to cold dark matter.