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Dark Energy and Viscous Cosmology

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abstract

Singularities in the dark energy universe are discussed, assuming that there is a bulk viscosity in the cosmic fluid. In particular, it is shown how the physically natural assumption of letting the bulk viscosity be proportional to the scalar expansion in a spatially flat FRW universe can drive the fluid into the phantom region (w < -1), even if lies in the quintessence region (w > -1) in the non-viscous case.

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2021 1

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  • In the Realm of the Hubble tension $-$ a Review of Solutions astro-ph.CO · 2021-03-01 · unverdicted · none · ref 206 · internal anchor

    A review summarizing the Hubble constant tension and proposed solutions from new physics that restore agreement between Planck CMB data and local H0 measurements within 1-2 sigma.