Viscous Spacetime Fluid and Higher Curvature Gravity

Details Viscous Spacetime Fluid and Higher Curvature Gravity Viscous Spacetime Fluid and Higher Curvature Gravity

2007-05-26

arxiv.org/abs/0705.3882v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, no figures, submitted for publication

Scientific paper

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.

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