  We explore the cosmological implications of the interactions among the dark
particles in the dark $SU(2)_R$ model. It turns out that the relevant
interaction is between dark energy and dark matter, through a decay process.
With respect to the standard $\Lambda$CDM model, it changes only the background
equations. We note that the observational aspects of the model are dominated by
degeneracies between the parameters that describe the process. Thus, only the
usual $\Lambda$CDM parameters, such as the Hubble expansion rate and the dark
energy density parameter (interpreted as the combination of the densities of
the dark energy doublet) could be constrained by observations at this moment.
