Can neutrino viscosity drive the late time cosmic acceleration?

Abstract

In this paper it has been shown that the neutrino bulk viscous stresses can give rise to the late time acceleration of the universe. It is found that a number of spatially flat FRW models with a negative deceleration parameter can be constructed using neutrino viscosity and one of them mimics a $\Lambda$CDM model. This does not require any exotic dark energy component or any modification of gravity.

8 pages, 3 figures

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• Dynamics of dark energy
• Le Chatelier-Braun principle in cosmological physics
• Cosmology of Mass-Varying Neutrinos Driven by Quintessence: Theory and Observations
• Bulk viscosity of a gas of neutrinos and coupled scalar particles, in the era of recombination
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• Viscosity in cosmic fluids
• Viscous Self Interacting Dark Matter Cosmology For Small Redshift
• Global 21-cm brightness temperature in viscous dark energy models
• Viscous attenuation of gravitational waves propagating through an inhomogeneous background
• Lightening the Dark Matter from its Viscosity and Explanation of EDGES Anomaly
• Analytical formulas for shear and bulk viscosities in relativistic gaseous mixtures with constant cross sections