A cascade decaying dark matter model combining early and late effects still cannot reduce the Hubble tension below about 3 sigma, and is statistically disfavored relative to Lambda CDM.
Dark matter with two- and many-body decays and supernovae type Ia
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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. We find that for a daughter relativistic fraction of 1% and higher, lifetimes of at least less than 10 Gyrs are excluded, with larger relativistic fractions constraining longer lifetimes.
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Interpreting the Hubble tension with a cascade decaying dark matter sector
A cascade decaying dark matter model combining early and late effects still cannot reduce the Hubble tension below about 3 sigma, and is statistically disfavored relative to Lambda CDM.