Bounds on Neutrino Mass in Viscous Cosmology

Abstract

Effective field theory of dark matter fluid on large scales predicts the presence of viscosity of the order of $10^{-6}{H}_0{M}_P^2$. It has been shown that this magnitude of viscosities can resolve the discordance between large scale structure observations and Planck CMB data in the ${\sigma }_8$-${\Omega }_m^0$ and $H_0$-${\Omega }_m^0$ parameters space. Massive neutrinos suppresses the matter power spectrum on the small length scales similar to the viscosities. We show that by including the effective viscosity, which arises from summing over non linear perturbations at small length scales, severely constrains the cosmological bound on neutrino masses. Under a joint analysis of Planck CMB and different large scale observation data, we find that upper bound on the sum of the neutrino masses at 2-$\sigma$ level, decreases from $\sum m_{\nu }\le 0.396$eV (normal hierarchy) and $\sum m_{\nu }\le 0.378$eV (inverted hierarchy) to $\sum m_{\nu }\le 0.267$eV (normal hierarchy) and $\sum m_{\nu }\le 0.146$eV (inverted hierarchy) when the effective viscosities are included.

19 pages, 13 figures

References in corpus (15)

• Massive neutrinos and cosmology
• The Effective Field Theory of Cosmological Large Scale Structures
• Limit on Neutrinoless ββ Decay of Xe-136 from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in Ge-76
• Indications of a late-time interaction in the dark sector
• Tension between the power spectrum of density perturbations measured on large and small scales
• Neutrino cosmology and Planck
• Neutrino masses and their ordering: Global Data, Priors and Models
• Light dark photon and fermionic dark radiation for the Hubble constant and the structure formation
• Residual Non-Abelian Dark Matter and Dark Radiation
• A Comparison of Cosmological Parameters Determined from CMB Temperature Power Spectra from the South Pole Telescope and the Planck Satellite
• Cosmic viscosity as a remedy for tension between PLANCK and LSS data
• Hidden Charged Dark Matter and Chiral Dark Radiation
• Dependence of the Cosmic Microwave Background Lensing Power Spectrum on the Matter Density
• Viscous Self Interacting Dark Matter and Cosmic Acceleration
• Baryon Acoustic Oscillations

Cited by in corpus (12)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Cosmological constraints on late-universe decaying dark matter as a solution to the $H_0$ tension
• Neutrino masses and beyond-$\Lambda$CDM cosmology with LSST and future CMB experiments
• Viscous dark matter and 21 cm cosmology
• Viscosity in cosmic fluids
• Inflation models in the light of self-interacting sterile neutrinos
• Can the Hubble tension be resolved by bulk viscosity?
• Viscous Self Interacting Dark Matter Cosmology For Small Redshift
• Dark Matter Cosmology with Varying Viscosity: a Possible Resolution to the $S_8$ Tension
• Viscous attenuation of gravitational waves propagating through an inhomogeneous background
• Gravitational Wave emission in Binary Neutron Star early post-merger within a dark environment
• Lightening the Dark Matter from its Viscosity and Explanation of EDGES Anomaly