158 citations · 1.8k across the 69 of their papers we have counts for
52 papers · 1 filter
Noncommutativity and logarithmic correction to the black hole entropy
Kumar S. Gupta, Tajron Jurić, Anđelo Samsarov +1
We study the noncommutative corrections to the entropy of the Reissner-Nordström black hole using a -deformed scalar probe within the brick-wall framework. The noncommutativity…
Noncommutativity and the Weak Cosmic Censorship
Kumar S. Gupta, Tajron Jurić, Andjelo Samsarov +1
We show that a noncommutative massless scalar probe can dress a naked singularity in spacetime, consistent with the weak cosmic censorship. The dressing occurs at high ener…
Conformal quantum mechanics and holography in noncommutative space-time
Kumar S. Gupta, E. Harikumar, Zuhair N. S.
We analyze the effects of noncommutativity in conformal quantum mechanics (CQM) using the -deformed space-time as a prototype. Upto the first order in the deformation parameter,…
Twisted statistics and the structure of Lie-deformed Minkowski spaces
Daniel Meljanac, Stjepan Meljanac, Danijel Pikutić +1
We show that the realizations of noncommutative coordinates that are linear in the Lorentz generators form a closed Lie algebra under certain conditions. The star product and the c…
Noncommutative duality and fermionic quasinormal modes of the BTZ black hole
Kumar S. Gupta, Tajron Jurić, Andjelo Samsarov
We analyze the fermionic quasinormal modes of the BTZ black hole in the presence of space-time noncommutativity. Our analysis exploits a duality between a spinless and spinning BTZ…
Noncommutative scalar quasinormal modes and quantization of entropy of a BTZ black hole
Kumar S. Gupta, E. Harikumar, Tajron Jurić +2
We obtain an exact analytic expression for the quasinormal modes of a noncommutative massless scalar field in the background of a massive spinless BTZ black hole up to the first or…
Entropy from Scaling Symmetry Breaking
Neymar Cavalcante, Saulo Diles, Kumar S. Gupta +1
The scaling symmetry in conformal quantum mechanics (CQM) can be broken due to the boundary conditions that follow from the requirement of a unitary time evolution of the Hamiltoni…
Effects of Noncommutativity on the Black Hole Entropy
Kumar S. Gupta, E. Harikumar, Tajron Juric +2
In this paper the BTZ black hole geometry is probed with a noncommutative scalar field which obeys the -Minkowski algebra. The entropy of the BTZ black hole is calculated using…
Anomalies and Renormalization of Impure States in Quantum Theories
Kumar S. Gupta, Amilcar Queiroz
In a Hamiltonian approach to anomalies parity and time reversal symmetries can be restored by introducing suitable impure (or mixed) states. However, the expectation values of obse…
Different realizations of kappa-momentum space and relative-locality effect
Stjepan Meljanac, Anna Pachol, Andjelo Samsarov +1
We consider different realizations for the momentum sector of kappa-Poincare Hopf algebra, which is associated with a curved momentum space. We show that the notion of the particle…
Effect of topological defects and Coulomb charge on the low energy quantum dynamics of gapped graphene
Baishali Chakraborty, Kumar S. Gupta, Siddhartha Sen
We study the combined effect of a conical topological defect and a Coulomb charge impurity on the dynamics of Dirac fermions in gapped graphene. Beyond a certain strength of the Co…
Phase structures in fuzzy geometries
T R Govindarajan, S. Digal, K. S. Gupta +1
We study phase structures of quantum field theories in fuzzy geometries. Several examples of fuzzy geometries as well as QFT's on such geometries are considered. They are fuzzy sph…
Quantum statistics and noncommutative black holes
Kumar S. Gupta, Stjepan Meljanac, Andjelo Samsarov
We study the behaviour of a scalar field coupled to a noncommutative black hole which is described by a -cylinder Hopf algebra. We introduce a new class of realizations of this…
The Central Charge of the Warped AdS^3 Black Hole
Kumar S. Gupta, E. Harikumar, Siddhartha Sen +1
The AdS/CFT conjecture offers the possibility of a quantum description for a black hole in terms of a CFT. This has led to the study of general AdS^3 type black holes with a view t…
Geometric Finiteness, Holography and Quasinormal Modes for the Warped AdS_3 Black Hole
Kumar S. Gupta, E. Harikumar, Siddhartha Sen +1
We show that there exists a precise kinematical notion of holography for the Euclidean warped black hole. This follows from the fact that the Euclidean warped black…
Constraints on the quantum gravity scale from kappa - Minkowski spacetime
A. Borowiec, Kumar S. Gupta, S. Meljanac +1
We compare two versions of deformed dispersion relations (energy vs momenta and momenta vs energy) and the corresponding time delay up to the second order accuracy in the quantum g…
Deformed Oscillator Algebras and QFT in -Minkowski Spacetime
T. R. Govindarajan, Kumar S. Gupta, E. Harikumar +2
In this paper we study the deformed statistics and oscillator algebras of quantum fields defined in -Minkowski spacetime. The twisted flip operator obtained from the twist assoc…
Scalar field dynamics in warped AdS_3 black hole background
Sayan K. Chakrabarti, Pulak Ranjan Giri, Kumar S. Gupta
We study the normal modes of a scalar field in the background of a warped AdS_3 black hole which arises in topologically massive gravity. We discuss the normal mode spectrum using…
Bound States in Gapped Graphene with Impurities : Effective Low-Energy Description of Short-Range Interactions
Kumar S. Gupta, Siddhartha Sen
We obtain a novel bound state spectrum of the low energy excitations near the Fermi points of graphene in the presence of a charge impurity. The effects of possible short range int…
Normal mode analysis for scalar fields in BTZ black hole background
Sayan K Chakrabarti, Pulak Ranjan Giri, Kumar S. Gupta
We analyze the possibility of inequivalent boundary conditions for a scalar field propagating in the BTZ black hole space-time. We find that for certain ranges of the black hole pa…
Inequivalent quantization of the rational Calogero model with a Coulomb type interaction
B. Basu-Mallick, Kumar S. Gupta, S. Meljanac +1
We consider the inequivalent quantizations of a -body rational Calogero model with a Coulomb type interaction. It is shown that for certain range of the coupling constants, this…
Twisted Statistics in kappa-Minkowski Spacetime
T. R. Govindarajan, Kumar S. Gupta, E. Harikumar +2
We consider the issue of statistics for identical particles or fields in kappa-deformed spaces, where the system admits a symmetry group G. We obtain the twisted flip operator comp…
Universal near-horizon conformal structure and black hole entropy
Sayan K. Chakrabarti, Kumar S. Gupta, Siddhartha Sen
It is shown that a massless scalar probe reveals a universal near-horizon conformal structure for a wide class of black holes, including the BTZ. The central charge of the correspo…
Interacting Quantum Topologies and the Quantum Hall Effect
A. P. Balachandran, Kumar S. Gupta, Seckin Kurkcuoglu
The algebra of observables of planar electrons subject to a constant background magnetic field B is given by A_theta(R^2) x A_theta(R^2) the product of two mutually commuting Moyal…