Dark matter with two- and many-body decays and supernovae type Ia

Understand

We present a decaying dark matter scenario where the daughter products are a single massless relativistic particle and a single, massive but possibly relativistic particle.

• We calculate the velocity distribution of the massive daughter particle and its associated equation of state and derive its dynamical evolution in an expanding universe.
• In addition, we present a model of decaying dark matter where there are many massless relativistic daughter particles together with a massive particle at rest.
• We place constraints on these two models using supernovae type Ia observations.