Testing the equation of state for viscous dark energy

Abstract

Some cosmological scenarios with bulk viscosity for the dark energy fluid are considered. Based on some considerations related to hydrodynamics, two different equations of state for dark energy are assumed, leading to power-law and logarithmic effective corrections to the pressure. The models are tested with the latest astronomical data from Type Ia supernovae (Pantheon sample), measurements of the Hubble parameter $H(z)$, Baryon Acoustic Oscillations and Cosmic Microwave Background radiation. In comparison with $\Lambda$CDM model, some different results are obtained and their viability is discussed. The power-law model shows some modest results, achieved under negative values of bulk viscosity, while the logarithmic scenario provide good fits in comparison to $\Lambda$CDM model.

13 pages, 3 figures. To be published in PRD

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• Viscous cosmology in $f(T)$ gravity
• Effective equation of state in modified gravity and observational constraints
• Cosmic acceleration with bulk viscosity in an anisotropic $f(R,L_m)$ background
• Modified Equations of State for Dark Energy and Observational Limitations
• Energy conditions for Inhomogeneous EOS and its Thermodynamics analysis with the resolution on finite time future singularity problems
• Evolution of dissipative and non-dissipative universes in holographic cosmological models with a power-law term
• An approach to cold dark matter deviation and the $H_0$ tension problem by using machine learning
• Note on bulk viscosity as an alternative to dark energy