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- W1516902416 abstract "The Einstein field equation as an equation of state of a thermodynamical system of spacetime is reconsidered in the present Letter. We argue that a consistent interpretation leads us to identify scalar curvature and cosmological constant terms representing the bulk viscosity of the spacetime fluid. Since Einstein equation itself corresponds to a near-equilibrium state in this interpretation invoking $f(R)$ gravity for nonequilibrium thermodynamics is not required. A logically consistent generalization to include the effect of so called 'tidal forces' due to the Riemann curvature is presented. A new equation of state for higher curvature gravity is derived and its physical interpretation is discussed." @default.
- W1516902416 created "2016-06-24" @default.
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- W1516902416 date "2007-05-26" @default.
- W1516902416 modified "2023-09-23" @default.
- W1516902416 title "Viscous Spacetime Fluid and Higher Curvature Gravity" @default.
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