Late-time decaying dark matter: constraints and implications for the H0-tension

We constrain and update the bounds on the lifetime 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 lifetime are found to be tau > 9Gyr and tau > 11Gyr at 95 per cent C.L., for the two-body and many-body decay scenarios, respectively. We also comment on the recent proposal that the current two-body decaying dark matter model can provide resolution for the H-0-tension, by contrasting against the standard Lambda CDM model. We infer that the current dark matter decaying scenario is unlikely to alleviate the H-0-tension. We find that the decaying dark matter is able to reduce the trend of the decreasing H-0 values with increasing lens redshifts observed in the strong lensing data set.