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- W1986203419 abstract "The equations governing a flat Robertson-Walker cosmological model containing a dissipative Boltzmann gas are integrated numerically. The bulk viscous stress is modeled using the Eckart and Israel-Stewart theories of dissipative relativistic fluids; the resulting cosmologies are compared and contrasted. The Eckart models are shown to always differ in a significant quantitative way from the Israel-Stewart models. It thus appears inappropriate to use the pathological (nonhyperbolic) Eckart theory for cosmological applications. For large bulk viscosities, both cosmological models approach asymptotic nonequilibrium states; in the Eckart model the total pressure is negative, while in the Israel-Stewart model the total pressure is asymptotically zero. The Eckart model also expands more rapidly than the Israel-Stewart models. These results suggest that bulk-viscous inflation may be an artifact of using a pathological fluid theory such as the Eckart theory." @default.
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- W1986203419 date "1991-05-15" @default.
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- W1986203419 title "Dissipative Boltzmann-Robertson-Walker cosmologies." @default.
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- W1986203419 doi "https://doi.org/10.1103/physrevd.43.3249" @default.
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