Physical process first law and increase of horizon entropy for black holes in Einstein-Gauss-Bonnet gravity

Abstract

We establish the physical process version of first law by studying small perturbations of a stationary black hole with regular bifurcation surface in Einstein-Gauss-Bonnet (EGB) gravity. Our result shows that when the stationary black hole is perturbed by a matter stress energy tensor and finally settles down to a new stationary state, the Wald entropy increases as long as the matter satisfies null energy condition.

Some more typos corrected. Accepted for publication in Phys. Rev. Lett

References in corpus (1)

• The Physical Process First Law for Bifurcate Killing Horizons

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