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Item Entropy increase during physical processes for black holes in Lanczos-Lovelock gravity(American physical society, 2012-07-03) Padmanabhan, T.; Kolekar, Sanved; Sarkar, SudiptaWe study quasistationary physical process for black holes within the context of Lanczos-Lovelock gravity. We show that the Wald entropy of the stationary black holes in Lanczos-Lovelock gravity monotonically increases for quasistationary physical processes in which the horizon is perturbed by the accretion of positive energy matter and the black hole ultimately settles down to a stationary state. This result reinforces the physical interpretation of Wald entropy for Lanczos-Lovelockmodels and takes a step towards proving the analogue of the black hole area increase theorem in a wider class of gravitational theories.Item Ideal gas in a strong gravitational field: Area dependence of entropy(American Physical Society, 2011-03-24) Kolekar, Sanved; Padmanabhan, T.