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  • Black hole topology in f(R) gravity 
    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 ...
  • 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 ...
  • Overcharging a multi-black-hole system and cosmic censorship 
    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 ...
  • Quasinormal modes and strong cosmic censorship in the regularised 4D Einstein�Gauss�Bonnet gravity 
    Mishra, Akash K. (Springer, 2020-11)
    The fate of strong cosmic censorship is ultimately linked to the extendibility of perturbation across the Cauchy Horizon and known to be violated in the near extremal region of a charged de Sitter black hole. Similar ...
  • Strong cosmic censorship conjecture in higher curvature gravity 
    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 ...
  • Understanding photon sphere and black hole shadow in dynamically evolving spacetimes 
    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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