Cosmic viscosity as a remedy for tension between PLANCK and LSS data

Abstract

Measurements of ${\sigma }_8$ from large scale structure observations show a discordance with the extrapolated ${\sigma }_8$ from Planck CMB parameters using $\Lambda$CDM cosmology. Similar discordance is found in the value of $H_0$ and ${\Omega }_m$. In this paper, we show that the presence of viscosity in cold dark matter, shear or bulk or combination of both, can remove the above mentioned conflicts simultaneously. This indicates that the data from Planck CMB observation and different LSS observations prefer small but non-zero amount of viscosity in cold dark matter fluid.

16 pages, 13 figs, matches accepted version in JCAP

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Cited by in corpus (19)

• Cosmology Intertwined III: $f{\sigma }_8$ and $S_8$
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Cosmological discordances II: Hubble constant, Planck and large-scale-structure data sets
• Relaxing the ${\sigma }_8$-tension through running vacuum in the Universe
• Accelerated and decelerated expansion in a causal dissipative cosmology
• Growth of matter perturbations in the extended viscous dark energy models
• Microphysical manifestations of viscosity and consequences for anisotropies in the very early universe
• Can the Hubble tension be resolved by bulk viscosity?
• A new Parametrization for Bulk Viscosity Cosmology as Extension of the $\Lambda$CDM Model
• Linearized propagation equations for metric fluctuations in a general (non-vacuum) background geometry
• Study of a viscous $\Lambda$WDM model: Near equilibrium condition, entropy production, and cosmological constraints
• Global 21-cm brightness temperature in viscous dark energy models
• 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 luminosity distance in viscous cosmological models
• Exploring thermodynamics inconsistencies in unimodular gravity: a comparative study of two energy diffusion functions
• Scalar field unification of interacting viscous dark fluid from a geometrical scalar-tensor theory of gravity
• Ricci cosmology in light of astronomical data
• Singularities and Soft-Big Bang in a viscous $\Lambda$CDM model