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

Abstract

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 $m_{sp}^{\mathrm{eff}}$ and its contribution to the relativistic degrees of freedom at CMB decoupling $\Delta N_{\mathrm{eff}}$. 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 $m_{sp}^{\mathrm{eff}},\Delta N_{\mathrm{eff}}$. In combination with a measurement of $S_8$ from KIDS1000+BOSS+2dfLenS, the $S_8$-tension would hint at the existence of a particle of mass $m_{sp}^{\mathrm{eff}}\simeq 0.67_{-0.48}^{+0.26}$ $\mathrm{eV}$ with a contribution to $\Delta N_{\mathrm{eff}}\simeq 0.06\pm 0.05$. However, Pantheon and BOSS BAO/$f{\sigma }_8$ data restricts the particle mass to $m_{sp}^{\mathrm{eff}}\simeq 0.48_{-0.36}^{+0.17}$ and contribution to $\Delta N_{\mathrm{eff}}\simeq 0.046_{-0.031}^{+0.004}$. We discuss implications of our results for other canonical non-thermal HDM models -- the Dodelson-Widrow model and a thermal sterile particle with a different temperature in the hidden sector. We report competitive results on such hidden sector temperature which might have interesting implications for particle physics model building, in particular connecting the $S_8$-tension to the longstanding short baseline oscillation anomaly.

accepted Physical Review D, new figures, references and discussion added conclusion is same

References in corpus (25)

• In the Realm of the Hubble tension $-$ a Review of Solutions
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Massive neutrinos and cosmology
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints
• The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
• Reheating in Inflationary Cosmology: Theory and Applications
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• Calibration of the Tip of the Red Giant Branch (TRGB)
• Probing the interaction between dark matter and dark energy in the presence of massive neutrinos
• Late universe decaying dark matter can relieve the H_0 tension
• Constraints from Ly-$\alpha$ forests on non-thermal dark matter including resonantly-produced sterile neutrinos
• Thermal Dark Matter From A Highly Decoupled Sector
• How warm are non-thermal relics? Lyman-$\alpha$ bounds on out-of-equilibrium dark matter
• Quantifying the $S_8$ tension with the Redshift Space Distortion data set
• Constraints on $\Lambda$CDM Extensions from the SPT-3G 2018 $EE$ and $TE$ Power Spectra
• Cosmological constraints on multi-interacting dark matter
• Cosmological constraints on late-universe decaying dark matter as a solution to the $H_0$ tension
• Linear cosmological constraints on 2-body decaying dark matter scenarios and the $S_8$ tension
• MeV sterile neutrinos in low reheating temperature cosmological scenarios
• Late-time decaying dark matter: constraints and implications for the $H_0$-tension
• When FIMPs Decay into Neutrinos: The $N_{\mathrm{eff}}$ Story
• Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound

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• Cosmological perturbations: non-cold relics without the Boltzmann hierarchy
• Constraining Hot Dark Matter Sub-Species with Weak Lensing and the Cosmic Microwave Background Radiation
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