6 papers
Entropic route to Brown-York tensor: A unified framework for null and timelike hypersurfaces
Krishnakanta Bhattacharya, Bhera Ram, Bibhas Ranjan Majhi
Building on Padmanabhan's entropy functional, originally introduced to derive Einstein's equations and highlight the emergent nature of gravity, we demonstrate its robustness in a…
Generalized First Law and Smarr Formula: Beyond Additivity and Extensivity
Usman Zafar, Krishnakanta Bhattacharya, Kazuharu Bamba
The study of black hole thermodynamics becomes a central topic in gravitational physics, where the first law and the Smarr relation establish a deep connection between spacetime ge…
Chaotic Dynamics in Extremal Black Holes: A Challenge to the Chaos Bound
Surojit Dalui, Chiranjeeb Singha, Krishnakanta Bhattacharya
We investigate chaotic dynamics in extremal black holes by analyzing the motion of massless particles in both Reissner-Nordström and Kerr geometries. Two complementary approaches…
A note on gravity and fluid dynamic correspondence on a null hypersurface
Krishnakanta Bhattacharya, Sumit Dey, Bibhas Ranjan Majhi
In the extensive literature on fluid-gravity correspondence formulated on null hypersurfaces, the Carrollian and membrane paradigm approaches have predominantly employed a timelike…
Thermodynamic analysis of black holes with cloud of strings and quintessence via Barrow entropy
Usman Zafar, Kazuharu Bamba, Tabinda Rasheed +1
We explore a Reissner-Nordström Anti-de Sitter (RN-AdS) black hole with a cloud of string and quintessence to study thermodynamics and thermodynamic topology in the presence of Ba…
Scalar-tensor theories of gravity from a thermodynamic viewpoint
Krishnakanta Bhattacharya, Sumanta Chakraborty
In any diffeomorphism invariant theory of gravity, one can define a Noether charge arising from the invariance of the Lagrangian under diffeomorphisms. We have determined the Noeth…