# Late universe decaying dark matter can relieve the H_0 tension

## TL;DR

This paper explores how decaying dark matter in the late universe, especially with warm massive daughters, can help resolve the H_0 tension between local and CMB measurements.

## Contribution

It introduces a model of dark matter decay with specific decay products that can alleviate the H_0 tension in cosmology.

## Key findings

- Warm massive decay products can reconcile H_0 measurements
- Decaying dark matter impacts late-time cosmological observations
- Model provides a potential solution to the H_0 tension

## Abstract

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.