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  • Fairoos, C.; Ghosh, Avirup; Sarkar, Sudipta (Cornell University Library, 2018-02)
    We study the entropy evolution of black holes in Lovelock gravity by formulating a thermodynamic generalization of null Raychaudhuri equation. We show that the similarity between the expressions of entropy change of the ...
  • Ghosh, Rajes; Sarkar, Sudipta (Cornell University Library, 2020-09)
    The zeroth law of black hole mechanics is an assertion of constancy of the surface gravity on a stationary Killing horizon. The Hawking temperature of the black hole horizon is proportional to the surface gravity. Therefore, ...
  • Fairoos, C.; Ghosh, Avirup; Sarkar, Sudipta (Cornell University Library, 2017-05)
    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 ...
  • Ghosh, Avirup; Jana, Soumya; Mishra, Akash K.; Sarkar, Sudipta (Cornell University Library, 2019-06)
    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 ...
  • Bhattacharjee, Srijit; Bhattacharyya, Arpan; Sarkar, Sudipta; Sinha, Aninda (Cornell University Library, 2015-07)
    We show that for a general four derivative theory of gravity, only the holographic entanglement entropy functionals obey the second law at linearized order in perturbations. We also derive bounds on the higher curvature ...
  • C., Fairoos; Sarkar, Sudipta; Yogendran, K. P. (Cornell University Library, 2017-03)
    The purely thermal nature of Hawking radiation from evaporating black holes leads to the information loss paradox. A possible route to its resolution could be if (enough) correlations are shown to be present in the radiation ...
  • Bhattacharjee, Srijit; Sarkar, Sudipta; Wall, Aron C. (Cornell University Library, 2015-04)
    Standard methods for calculating the black hole entropy beyond general relativity are ambiguous when the horizon is non stationary. We fix these ambiguities in all quadratic curvature gravity theories, by demanding that ...
  • Bhattacharjee, Srijit; Sarkar, Sudipta; Virmani, Amitabh (Cornell University Library, 2016-04)
    When an electrically charged black hole is perturbed its inner horizon becomes a singularity, often referred to as the Poisson-Israel mass inflation singularity. Ori constructed a model of this phenomenon for asymptotically ...
  • Parikh, Maulik; Sarkar, Sudipta; Svesko, Andrew (Cornell University Library, 2018-01)
    We find a local first law of thermodynamics, ΔE=TΔS−W, connecting gravitational entropy, S, with matter energy and work. For Einstein gravity S is the Bekenstein-Hawking entropy, while for more general theories of gravity ...
  • Bhattacharjee, Srijit; Sarkar, Sudipta (Cornell University Library, 2017-04)
    We prove the non existence of massive scalar, vector and tensor hairs outside the surface of a static and stationary compact reflecting star. Our result is the extension of the no hair theorem for black holes to horizonless ...
  • Mishra, Akash K.; Sarkar, Sudipta (Cornell University Library, 2019-05)
    We study the generalization of the gadenken experiment of overcharging an extremal black hole proposed by Wald in the context of a multi black hole solution. In particular, we attempt to overcharge a system of two extremal ...
  • Jana, Soumya; Shaikh, Rajibul; Sarkar, Sudipta (Cornell University Library, 2018-08)
    The Born-Infeld gravity is a modification of the theory of general relativity inspired by the nonlinear Born-Infeld electrodynamics. The theory is described by a series of higher curvature terms added to the Einstein-Hilbert ...
  • Ghosh, Rajes; Fairoos, C.; Sarkar, Sudipta (Cornell University Library, 2019-06)
  • Bhattacharjee, Srijit; Sarkar, Sudipta (arXiv Cornell University Library, 2014-12)
    We study the perturbation induced by a slowly rotating massive object as it passes through a Rindler horizon. It is shown that the passage of this object can be approximately modeled as Delta\,function type tidal distortions ...
  • Chakraborty, Sumanta; Ghosh, Avirup; Sarkar, Sudipta (Cornell University Library, 2017-09)
    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. In dynamical ...
  • Chakraborty, Sumanta; Ghosh, Avirup; Sarkar, Sudipta (Cornell University Library, 2017-09)
    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. In dynamical ...
  • Mishra, Akash K.; Chakraborty, Sumanta; Sarkar, Sudipta (Cornell University Library, 2019-03)
    We study rheology, microstructure, and response to an applied electric field (E) in suspensions of fumed alumina (Al2O3) nanoparticles in a nematic liquid crystal (NLC) made of N-(4-methoxybenzylidene)-4-butylaniline (MBBA). ...

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