Assessing the impact of bulk and shear viscosities on large scale structure formation

Abstract

It is analyzed the effects of both bulk and shear viscosities on the perturbations, relevant for structure formation in late time cosmology. It is shown that shear viscosity can be as effective as the bulk viscosity on suppressing the growth of perturbations and delaying the nonlinear regime. A statistical analysis of the shear and bulk viscous effects is performed and some constraints on these viscous effects are given.

V2. Final version

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• A new Parametrization for Bulk Viscosity Cosmology as Extension of the $\Lambda$CDM Model
• The Integrated Sachs-Wolfe Effect in the Bulk Viscous Dark Energy Model
• Early-time thermalization of cosmic components? A hint for solving cosmic tensions
• Dark Matter Cosmology with Varying Viscosity: a Possible Resolution to the $S_8$ Tension
• Vector perturbations in bouncing cosmology
• Evolution of dissipative and non-dissipative universes in holographic cosmological models with a power-law term
• Viscous attenuation of gravitational waves propagating through an inhomogeneous background
• A comparative analysis of dissipation coefficients in warm inflation
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• Modified gravity versus shear viscosity: imprints on the scalar matter perturbations
• Stage IV CMB forecasts for warm inflation
• Note on bulk viscosity as an alternative to dark energy
• Singularities and Soft-Big Bang in a viscous $\Lambda$CDM model
• Backreaction from inhomogeneous matter fields during large-scale structure formation