Models of coupled dark matter to dark energy

Understand

We present three distinct types of models of dark energy in the form of a scalar field which is explicitly coupled to dark matter.

• Our construction draws from the pull-back formalism for fluids and generalises the fluid action to involve couplings to the scalar field.
• We investigate the cosmology of each class of model both at the background and linearly perturbed level.
• We choose a potential for the scalar field and a specific coupling function for each class of models and we compute the Cosmic Microwave Background and matter power spectra.