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We present a decaying dark matter scenario where the daughter products are asingle massless relativistic particle and a single, massive but possiblyrelativistic particle. We calculate the velocity distribution of the massivedaughter particle and its associated equation of state and derive its dynamicalevolution in an expanding universe. In addition, we present a model of decayingdark matter where there are many massless relativistic daughter particlestogether with a massive particle at rest. We place constraints on these twomodels using supernovae type Ia observations. We find that for a daughterrelativistic fraction of 1% and higher, lifetimes of at least less than 10 Gyrsare excluded, with larger relativistic fractions constraining longer lifetimes.

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