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Can decaying dark matter scenarios alleviate both $H_0$ and $\sigma_8$ tensions?
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abstract
Current tensions in cosmology, including $H_0$ and $\sigma_8$, provide one of the strong reasons to suspect the existence of physics beyond the standard model of cosmology ($\Lambda$CDM). In this paper, we investigate if there is a relation between these tensions and beyond cold dark matter scenarios. To model non-CDM, we assume a decaying dark matter (DDM) which is unstable and may decay into two daughter particles, a combination of cold dark matter, warm dark matter, and dark radiation, to explore a vast era of possibilities. We checked our model against CMB data and could show that decaying dark matter seems not a promising candidate to address the cosmological tensions.
Forward citations
Cited by 2 Pith papers
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Interpreting the Hubble tension with a cascade decaying dark matter sector
A cascade decaying dark matter model combining early and late effects still cannot reduce the Hubble tension below about 3 sigma, and is statistically disfavored relative to Lambda CDM.
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Alleviating Cosmological Tensions with the Hadrosymmetric Twin Higgs
The HTH cosmology fit yields a negligible twin-pion decay rate and density, so the reported H0-tension relief is an artifact of widened parameter errors rather than a new physical mechanism.
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