Late universe decaying dark matter can relieve 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.

6 pages, 4 figures

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• Self-interacting dark matter from late decays and the $H_0$ tension
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Sources of $H_0$-tensions in dark energy scenarios
• Hot thermal universe endowed with massive dark vector fields and the Hubble tension
• Trans-Planckian Censorship and Inflation in Grand Unified Theories
• The role of CMB spectral distortions in the Hubble tension: a proof of principle
• Decay of multiple dark matter particles to dark radiation in different epochs does not alleviate the Hubble tension
• Cosmological Parameter Estimation Using Current and Future Observations of Strong Gravitational Lensing
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• Light Dark Matter: A Common Solution to the Lithium and $H_0$ Problems
• Obtaining a scalar fifth force via a broken-symmetry couple between the scalar field and matter
• Cosmological decay of Higgs-like scalars into a fermion channel
• Metamorphosis of dwarf halo density profile under dark matter decays
• Blois 2019: highlights and outlook
• The $H_0$ and $S_8$ tensions necessitate early and late time changes to $\Lambda$CDM