We study the cosmological effects of two-body dark matter decays where the products of the decay include a massless and a massive particle. We show that if the massive daughter particle is slightly warm it is possible to relieve the tension between distance ladder measurements of the present day Hubble parameter with measurements from the cosmic microwave background.
@article{arxiv.1903.06220,
title = {Late universe decaying dark matter can relieve the H_0 tension},
author = {Kyriakos Vattis and Savvas M. Koushiappas and Abraham Loeb},
journal= {arXiv preprint arXiv:1903.06220},
year = {2019}
}