Dissipation in non-equilibrium spacetime thermodynamics

Details Dissipation in non-equilibrium spacetime thermodynamics Dissipation in non-equilibrium spacetime thermodynamics

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.222a2013c&link_type=abstract

Journal of Physics: Conference Series, Volume 222, Issue 1, pp. 012013 (2010).

Physics

Scientific paper

It has been recently realized [1, 2] that the thermodynamical derivation of the Einstein equation introduced by Jacobson [3] needs a generalization to a non-equilibrium thermodynamical setting. Here we show that the non-equilibrium character of spacetime thermodynamics - both in GR as well as in f(R) gravity - is generally related to non-local heat fluxes associated with the purely gravitational/internal degrees of freedom of the theory. In particular, we show that the allowed gravitational degrees of freedom can be fixed by the kinematics of the local spacetime causal structure, through the specific Equivalence Principle formulation. In this sense, the thermodynamical description seems to go beyond Einstein's theory as an intrinsic property of gravitation.

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