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  • Mishra, Akash K.; Rahman, Mostafizur; Sarkar, Sudipta (IOP Publishing, 2018-06)
    Hawking's topology theorem in general relativity restricts the cross-section of the event horizon of a black hole in 3+1 dimension to be either spherical or toroidal. The toroidal case is ruled out by the topology censorship ...
  • 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 ...
  • Mishra, Akash K.; Sarkar, Sudipta (American Physical Society, 2019-07)
    We study the generalization of the gedanken 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 ...
  • Mishra, Akash K.; Chakraborty, Sumanta (American Physical Society, 2020-03)
    The deterministic nature of general relativity is ensured by the strong cosmic censorship conjecture, which asserts that spacetime cannot be extended beyond the Cauchy horizon with the square integrable connection. Although ...
  • Mishra, Akash K.; Chakraborty, Sumanta; Sarkar, Sudipta (APS, 2019-05)
    We have derived the differential equation governing the evolution of the photon sphere for dynamical black hole spacetimes with or without spherical symmetry. Numerical solution of the same depicting evolution of the photon ...

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