70 citations · 426 across the 23 of their papers we have counts for
24 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-type Relation: Beyond Additivity and Extensivity
Usman Zafar, Krishnakanta Bhattacharya, Kazuharu Bamba
In this work, we develop a general framework for deriving the first law of black hole thermodynamics and the associated Smarr-type relation for 4-dimensional static spherically sym…
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 (…
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 Bar…
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…
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…
Topological interpretation of extremal and Davies-type phase transitions of black holes
Krishnakanta Bhattacharya, Kazuharu Bamba, Douglas Singleton
Topological arguments are currently being used as a novel scheme to discern the properties of black holes while ignoring their detailed structure and specific field equations. Amon…
Boundary terms and Brown-York quasi-local parameters for scalar-tensor theory: a study on both timelike and null hypersurfaces
Krishnakanta Bhattacharya, Kazuharu Bamba
Boundary term and Brown-York (BY) formalism, which is based on the Hamilton-Jacobi principle, are complimentary of each other as the gravitational actions are not, usually, well-po…
Scalar-tensor gravity from thermodynamic and fluid-gravity perspective
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
Out of several possible extensions of general relativity, the scalar-tensor theory is the most popular for several reasons. Since the quantum description of gravity is yet to be fo…
A novel probe of Einstein-Hilbert action: Dynamic upgradation of metric parameters
Krishnakanta Bhattacharya
The Einstein-Hilbert (EH) action is peculiar in many ways. Some of the Peculiar features have already been highlighted in literature. In the present article, we have discussed some…
Extended phase space thermodynamics of black holes: A study in Einstein's gravity and beyond
Krishnakanta Bhattacharya
In the extended phase space approach, one can define thermodynamic pressure and volume that gives rise to the van der Waals type phase transition for black holes. For Einstein's GR…
The Life and Science of Thanu Padmanabhan
Jasjeet Singh Bagla, Krishnakanta Bhattacharya, Sumanta Chakraborty +21
Thanu Padmanabhan was a renowned Indian theoretical physicist known for his research in general relativity, cosmology, and quantum gravity. In an extraordinary career spanning fort…
Thermodynamic structure of a generic null surface and the zeroth law in scalar-tensor theory
Sumit Dey, Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
We show that the equation of motion of scalar-tensor theory acquires thermodynamic identity when projected on a generic null surface. The relevant projection is given by $E_{ab}l^a…
Fluid-gravity correspondence in the scalar-tensor theory of gravity: (in)equivalence of Einstein and Jordan frames
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi, Douglas Singleton
The duality of gravitational dynamics (projected on a null hypersurface) and of fluid dynamics is investigated for the scalar tensor (ST) theory of gravity. The description of ST g…
Thermogeometric study of van der Waals like phase transition in black holes: an alternative approach
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
It is well-known that the non-extremal anti-de-Sitter (AdS) black holes show various van der Waals type criticalities, such as the , , , etc. In these cases,…
A general framework to study the extremal phase transition of black holes
Krishnakanta Bhattacharya, Sumit Dey, Bibhas Ranjan Majhi +1
We investigate the universality of some features for the extremal phase transition of black holes and unify all the approaches which have been applied in different spacetimes. Unli…
Abbott-Deser-Tekin like conserved quantities in Lanczos-Lovelock gravity: beyond Killing diffeomorphisms
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
We obtain the conserved Abbott-Deser-Tekin (ADT)-{\it like} current for the Lanczos-Lovelock gravity for a diffeomorphism vector, which defines the horizon of a spacetime and, impo…
Noether and Abbott-Deser-Tekin conserved quantities in scalar-tensor theory of gravity both in Jordan and Einstein frames
Krishnakanta Bhattacharya, Ashmita Das, Bibhas Ranjan Majhi
We revisit the thermodynamic aspects of the scalar-tensor theory of gravity in the Jordan and in the Einstein frame. Examining the {\it missing links} of this theory carefully, we…
Noncommutative Heisenberg algebra in the neighbourhood of a generic null surface
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
We show that the diffeomorphisms, which preserve the null nature for a generic null metric very near to the null surface, provide {\it noncommutative} Heisenberg algebra. This is t…
Van der Waals criticality in AdS black holes: a phenomenological study
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi, Saurav Samanta
AdS black holes exhibit van der Waals type phase transition. In the {\it extended} phase-space formalism, the critical exponents for any spacetime metric are identical to the stand…
Fluctuation-dissipation in accelerated frames
Ananya Adhikari, Krishnakanta Bhattacharya, Chandramouli Chowdhury +1
An uniformly accelerated (Rindler) observer will detect particles in the Minkowski vacuum, known as Unruh effect. The spectrum is thermal and the temperature is given by that of th…
Fresh look at the scalar-tensor theory of gravity in Jordan and Einstein frames from undiscussed standpoints
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
We study the scalar-tensor theory of gravity profoundly in the action level as well as in the thermodynamic level. Contrary to the usual description in the literature about the equ…
Thermogeometric description of the van der Waals like phase transition in AdS black holes
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
It is well known that interpreting the cosmological constant as the pressure, the AdS black holes behave as the van der Waals thermodynamic system. In this case, like a phase trans…
Temperature and thermodynamic structure of Einstein's equations for a cosmological black hole
Krishnakanta Bhattacharya, Bibhas Ranjan Majhi
It is expected that the cosmological black holes are the closest realistic solutions of gravitational theories and they evolve with time. Moreover, the natural way of defining ther…