203 citations · 3.4k across the 107 of their papers we have counts for
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Kinematics of Radion field: A possible source of dark matter
Sumanta Chakraborty, Soumitra SenGupta
The discrepancy between observed virial and baryonic mass in galaxy clusters have lead to the missing mass problem. To resolve this, a new, non-baryonic matter field, known as dark…
Spherically symmetric brane in a bulk of f(R) and Gauss-Bonnet Gravity
Sumanta Chakraborty, Soumitra SenGupta
Effective gravitational field equations on a four dimensional brane embedded in a five dimensional bulk have been considered. Using the Einstein-Hilbert action along with the Gauss…
Discrete quantum spectrum of black holes
Kinjalk Lochan, Sumanta Chakraborty
The quantum genesis of Hawking radiation is a long-standing puzzle in black hole physics. Semi-classically one can argue that the spectrum of radiation emitted by a black hole look…
Brown-York quasilocal energy in Lanczos-Lovelock gravity and black hole horizons
Sumanta Chakraborty, Naresh Dadhich
A standard candidate for quasilocal energy in general relativity is the Brown-York energy, which is essentially a two dimensional surface integral of the extrinsic curvature on the…
Thermodynamical interpretation of the geometrical variables associated with null surfaces
Sumanta Chakraborty, T. Padmanabhan
The emergent gravity paradigm interprets gravitational field equations as describing the thermodynamic limit of the underlying statistical mechanics of microscopic degrees of freed…
Spacetime with zero point length is two-dimensional at the Planck scale
T. Padmanabhan, Sumanta Chakraborty, Dawood Kothawala
It is generally believed that any quantum theory of gravity should have a generic feature --- a quantum of length. We provide a physical ansatz to obtain an effective non-local met…
Aspects of Neutrino Oscillation in Alternative Gravity Theories
Sumanta Chakraborty
Neutrino spin and flavour oscillation in curved spacetime have been studied for the most general static spherically symmetric configuration. Using the symmetry properties we have d…
Lanczos-Lovelock gravity from a thermodynamic perspective
Sumanta Chakraborty
The deep connection between gravitational dynamics and horizon thermodynamics leads to several intriguing features both in general relativity and in Lanczos-Lovelock theories of gr…
Gravitational field equations near an arbitrary null surface expressed as a thermodynamic identity
Sumanta Chakraborty, Krishnamohan Parattu, T. Padmanabhan
Previous work has demonstrated that the gravitational field equations in all Lanczos-Lovelock models imply a thermodynamic identity TdS=dE+PdV (where the variations are interpreted…
Effective field equation on m-brane embedded in n-dimensional bulk of Einstein and f(R) gravity
Sumanta Chakraborty, Soumitra SenGupta
We have derived effective gravitational field equations on a lower dimensional hypersurface (known as a brane), placed in a higher dimensional bulk spacetime for both Einstein and…
A quantum peek inside the black hole event horizon
Sumanta Chakraborty, Suprit Singh, T. Padmanabhan
We solve the Klein-Gordon equation for a scalar field, in the background geometry of a dust cloud collapsing to form a black hole, everywhere in the (1+1) spacetime: that is, both…
Metric factorizability and equivalence of brane world models with Brans-Dicke theory
Sumanta Chakraborty, Soumitra SenGupta
In the standard brane world models, the bulk metric ansatz is usually assumed to be factorizable in brane and bulk coordinates. However, it is not self-evident that it is always po…
A Boundary Term for the Gravitational Action with Null Boundaries
Krishnamohan Parattu, Sumanta Chakraborty, Bibhas Ranjan Majhi +1
Constructing a well-posed variational principle is a non-trivial issue in general relativity. For spacelike and timelike boundaries, one knows that the addition of the Gibbons-Hawk…