Non-abelian dark matter and dark radiation

I propose a new alternative to the Cold Dark Matter scenario, in which the Dark Sector contains a Dark Matter particle charged
under the Standard Model SU(2) gauge group and also charged under an unbroken SU(N) dark gauge group. By considering 
only scenarios with negligibly small confinement scale, the SU(N) dark gauge bosons behave as an additional type of radiation 
component. I discuss the effects of the dark gauge bosons in the CMB and also show that the interactions between Dark Matter 
and the dark gauge bosons give rise to a new regime in the evolution of Dark Matter overdensities, which lead to a smooth 
reduction of the power spectrum at small scale. I briefly discuss how this reduction reconcile CMB and LSS measurements.