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2021

Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension

Das, Subinoy, Maharana, Anshuman, Poulin, Vivian et al.

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The $\Lambda$CDM prediction of $S_8\equiv\sigma_8(\Omega_m/0.3)^{0.5}$ -- where $\sigma_8$ is the root mean square of matter fluctuations on a 8 $h^{-1}$Mpc scale -- once calibrated on Planck CMB data is $2-3\sigma$ lower than its direct estimate by a number of weak lensing surveys.

In this paper, we explore the possibility that the '$S_8$-tension' is due to a non-thermal hot dark matter (HDM) fractional contribution to the universe energy density leading to a power suppression at small-scales in the matter power spectrum.
Any HDM models can be characterized by its effective mass $ m_{sp}^{\rm eff}$ and its contribution to the relativistic degrees of freedom at CMB decoupling $\Delta N_{\rm eff}$.
Taking the specific example of a sterile particle produced from the decay of the inflaton during a matter dominated era, we find that from Planck only the tension can be reduced below $2\sigma$, but Planck does not favor a non-zero ${m_{sp}^{\rm eff},\Delta N_{\rm eff}}$.

Non-thermal neutrino-like hot dark matter in light of the $S_8$ tension · Around

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