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- W3104408369 abstract "We derive a general formalism for bulk viscous solutions of the energy-conservation-equation for $rho(a,zeta)$, both for a single-component and a multicomponent fluid in the Friedmann universe. For our purposes these general solutions become valuable in estimating order of magnitude of the phenomenological viscosity in the cosmic fluid at present. $H(z)$ observations are found to put an upper limit on the magnitude of the modulus of the present day bulk viscosity. It is found to be $zeta_0sim 10^6~$Pa s, in agreement with previous works. We point out that this magnitude is acceptable from a hydrodynamic point of view. Finally, we bring new insight by using our estimates of $zeta$ to analyse the fate of the future universe. Of special interest is the case $zeta propto sqrt{rho}$ for which the fluid, originally situated in the quintessence region, may slide through the phantom barrier and inevitably be driven into a big rip. Typical rip times are found to be a few hundred Gy." @default.
- W3104408369 created "2020-11-23" @default.
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- W3104408369 date "2016-06-02" @default.
- W3104408369 modified "2023-10-10" @default.
- W3104408369 title "General Bulk-Viscous Solutions and Estimates of Bulk Viscosity in the Cosmic Fluid" @default.
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- W3104408369 doi "https://doi.org/10.3390/e18060215" @default.
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