Late-time decaying dark matter: constraints and implications for the $H_0$-tension

Understand

We constrain and update the bounds on the life-time of a decaying dark matter model with a warm massive daughter particle using the most recent low-redshift probes.

• We use Supernovae Type-Ia, Baryon Acoustic Oscillations and the time delay measurements of gravitationally lensed quasars.
• These data sets are complemented by the early universe priors taken from the Cosmic Microwave background.
• For the maximum allowed fraction of the relativistic daughter particle, the updated bounds on the life-time are found to be $\tau > 9\, \rm{Gyr}$ and $\tau >11\,\rm{Gyr}$ at $95\%$ C.L., for the two-body and many-body decay scenarios, respectively.