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Decaying dark matter and the tension in $\sigma_8$
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abstract
We consider decaying dark matter (DDM) as a resolution to the possible tension between cosmic microwave background (CMB) and weak lensing (WL) based determinations of the amplitude of matter fluctuations, $\sigma_8$. We perform N-body simulations in a model where dark matter decays into dark radiation and develop an accurate fitting formula for the non-linear matter power spectrum, which enables us to test the DDM model by the combined measurements of CMB, WL and the baryon acoustic oscillation (BAO). We employ a Markov chain Monte Carlo analysis to examine the overlap of posterior distributions of the cosmological parameters, comparing CMB alone with WL+BAO. We find an overlap that is significantly larger in the DDM model than in the standard CDM model. This may be hinting at DDM, although current data is not constraining enough to unambiguously favour a non-zero dark matter decay rate $\Gamma$. From the combined CMB+WL data, we obtain a lower bound $\Gamma^{-1}\ge 97$ Gyr at 95 % C.L, which is less tight than the constraint from CMB alone.
Forward citations
Cited by 4 Pith papers
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Decaying Dark Matter Halo Abundance from a Revised Spherical Collapse Model
A mass-dependent collapse threshold from a revised spherical collapse model predicts the decaying-dark-matter halo mass function, matching N-body simulations at z≈1 and for mild kicks at z=0.
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Dark Matter with a Drag at Low Redshift
iDCDM adds two parameters to LambdaCDM so that dark matter decay produces late-time interacting radiation, yielding a distinctive low-redshift suppression of structure growth while leaving BBN and primary CMB unchanged.
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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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A frequentist view on the two-body decaying dark matter model
A frequentist reanalysis of Planck and KiDS-1000 data shows that a two-body decaying dark matter model can produce S8 values consistent with weak lensing surveys, and that prior choices dominated earlier Bayesian exclusions.
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