Professor T. Padmanabhan

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    Entropy increase during physical processes for black holes in Lanczos-Lovelock gravity
    (American physical society, 2012-07-03) Padmanabhan, T.; Kolekar, Sanved; Sarkar, Sudipta
    We 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.
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    Sehwarzschild solution: Some conceptual difficulties
    (Plenum Publishing Corporation, 1987-04-27) Narlikar, J. V.; Padmanabhan, T.
    It is shown that inconsistencies arise when we look upon the Schwarzschild solution as the space-time arising from a localized point singularity. The notion of black holes is critically examined, and it is argued that, since black hole formation never takes place within the past light cone of a typical external observer, the discussion of physical behavior of black holes, classical or quantum, is only of academic interest. It is suggested that problems related to the source could be avoided if the event horizon did not form and that the universe only contained quasi-black holes.