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  • Modular invariance and entanglement entropy 
    LOKHANDE, SAGAR FAKIRCHAND; MUKHI, SUNIL (Springer Nature, 2015-06)
    We study the Rényi and entanglement entropies for free 2d CFT’s at finite temperature and finite size, with emphasis on their properties under modular transformations of the torus. We address the issue of summing over ...
  • A membrane paradigm at large D 
    Bhattacharyya, Sayantani; DE, ANANDITA; Minwalla, Shiraz; Mohan, Ravi; Saha, Arunabha (Springer Nature, 2016-04)
    We study SO(d + 1) invariant solutions of the classical vacuum Einstein equations in p + d + 3 dimensions. In the limit d → ∞ with p held fixed we construct a class of solutions labelled by the shape of a membrane (the ...
  • The resolution of an entropy puzzle for 4D non-BPS black holes 
    BANERJEE, NABAMITA; Bansal, Sukruti; Lodato, Ivano (Springer Nature, 2016-05)
    We show the equality between macroscopic and microscopic (statistical) black hole entropy for a class of four dimensional non-supersymmetric black holes in N = 2 supergravity theory, up to the first subleading order in ...
  • The large D black hole membrane paradigm at first subleading order 
    Dandekar, Yogesh; DE, ANANDITA; Mazumdar, Subhajit; Minwalla, Shiraz; Saha, Arunabha (Springer Nature, 2016-12)
    In the large D limit, and under certain circumstances, it has recently been demonstrated that black hole dynamics in asymptotically flat spacetime reduces to the dynamics of a non gravitational membrane propagating in flat ...
  • Chaos in Field Theory and Gravity 
    SINGH, ANUP ANAND (2018-05)
    The fate of information contained in an object when it falls into a black hole has been a matter of debate since Hawking’s discovery that all black holes emit radiation and can eventually evaporate away. Though there has ...
  • The large D membrane paradigm for general four-derivative theory of gravity with a cosmological constant 
    KAR, ADITYA; Mandal, Taniya; Saha, Arunabha (Springer Nature, 2019-08)
    We find the membrane equations which describe the leading order in 1/D dynamics of black holes in the D → ∞ limit for the most general four-derivative theory of gravity in the presence of a cosmological constant. We work ...
  • Aspects of linearized perturbations of black holes and flat black strings 
    SADHU, AMRUTA (Dept. of Physics, 2019-11)
    This thesis presents a study in aspects of linearized perturbations of flat black strings and black holes in D dimensions. Main focus of the thesis is on analysis the non-spherically symmetric perturbations of these ...
  • Classical Soft Theorem in the AdS-Schwarzschild spacetime in small cosmological constant limit 
    Banerjee, Nabamita; BHATTACHARJEE, ARINDAM; Mitra, Arpita (Springer Nature, 2021-01)
    We have studied scattering of a probe particle by a four dimensional AdS-Schwarzschild black hole at large impact factor. Our analysis is consistent perturbatively to leading order in the AdS radius and black hole mass ...
  • Entanglement and Black Holes 
    KOKILOO, SUGAT (2022-05)
    Black Holes have an entropy that can be shown to depend on the area of its horizon. In this context, we look at the possibility of entanglement of quantum field modes across the horizon being the source of this entropy ...
  • Asymptotic Symmetries of Spacetime and Memory Effect 
    PAUL, KUNAL (2023-05)
    The work presented in this thesis can be broadly divided into two parts: In the first part, we study asymptotic symmetry groups using (i) Gauge-fixing approach and (ii) Geometric approach. The Gauge-fixing approach has ...
  • Near extremal black hole entropy 
    P B, HARITA (2023-05)
    Classically, the thermodynamics of near extremal black holes fails below a certain temperature. To avoid this problem, the existence of a “thermodynamic mass gap” between the extremal state and the lightest near extremal ...
  • Non-Linear Black Hole Ringdown 
    SINGH, JASVEER (2025-05)
    Imprints of non-linear effects of gravity are present in the quasi-normal modes of a black hole during its ringdown phase. In this work, we use methods to analytically calculate these non-linearities in the near horizon ...