title: 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 the first law by studying small perturbations of a stationary black hole with a regular bifurcation surface in Einstein-Gauss-Bonnet 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 the null energy condition.
authors.affiliation: The Institute of Mathematical Sciences, Chennai, India. achatterjee@imsc.res.in
authors.forename: Ayan
authors.initials: A
authors.lastname: Chatterjee
authors.forename: Sudipta
authors.initials: S
authors.lastname: Sarkar