Interacting warm dark matter

Understand

We explore a cosmological model composed by a dark matter fluid interacting with a dark energy fluid.

• The interaction term has the non-linear lambda*(rho_m)^alpha * (rho_e)^beta form, where rho_m and rho_e are the energy densities of the dark matter and dark energy, respectively.
• The parameters alpha and beta are in principle not constrained to take any particular values, and were estimated from observations.
• We perform an analytical study of the evolution equations, finding the fixed points and their stability properties in order to characterize suitable physical regions in the phase space of the dark matter and dark energy densities.