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  • Black hole entropy production and transport coefficients in Lovelock gravity 
    Fairoos, C.; Ghosh, Avirup; Sarkar, Sudipta (American Physical Society, 2018-07)
    We study the entropy evolution of black holes in Lovelock gravity by formulating a thermodynamic generalization of the null Raychaudhuri equation. We show that the similarity between the expressions of entropy change of ...
  • Boundary conservation from bulk symmetry 
    Fairoos, C.; Ghosh, Avirup; Sarkar, Sudipta (World Scientific, 2018-10)
    The evolution of the black-hole horizon can be effectively captured by a fictitious membrane fluid living on the stretched horizon. We show that the dynamics of this boundary matter arises from the invariance of the bulk ...
  • Constraints on higher curvature gravity from time delay between GW170817 and GRB 170817A 
    Ghosh, Avirup; Jana, Soumya; Mishra, Akash K.; Sarkar, Sudipta (American Physical Society, 2019-10)
    General relativity may be an effective theory with higher curvature correction terms in the action. Inclusion of these terms leads to exciting new possibilities, e.g., gravitational and electromagnetic perturbations following ...
  • Inhomogeneous Jacobi equation for minimal surfaces and perturbative change in holographic entanglement entropy 
    Ghosh, Avirup; Mishra, Rohit (American Physical Society, 2018-04)
    The change in holographic entanglement entropy (HEE) for small fluctuations about pure anti-de Sitter (AdS) is obtained by a perturbative expansion of the area functional in terms of the change in the bulk metric and the ...
  • Massless charged particles: Cosmic censorship, and the third law of black hole mechanics 
    Fairoos, C.; Ghosh, Avirup; Sarkar, Sudipta (American Physical Society, 2017-10)
    The formulation of the laws of Black hole mechanics assumes the stability of black holes under perturbations in accordance with the “cosmic censorship hypothesis” (CCH). CCH prohibits the formation of a naked singularity ...
  • On the physical process first law for dynamical black holes 
    Mishra, Akash; Chakraborty, Sumanta; Ghosh, Avirup; Sarkar, Sudipta (Springer, 2018-09)
    Physical process version of the first law of black hole mechanics relates the change in entropy of a perturbed Killing horizon, between two asymptotic cross sections, to the matter flow into the horizon. Here, we study the ...
  • Quasilocal first law of black hole dynamics from local Lorentz transformations 
    Chatterjee, Ayan; Ghosh, Avirup (Springer, 2018-07)
    Quasilocal formulations of black hole are of immense importance since they reveal the essential and minimal assumptions required for a consistent description of black hole horizon, without relying on the asymptotic boundary ...

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