39 citations · 116 across the 10 of their papers we have counts for
10 papers
Note on Morita Inequality for Planar Noncommutative Inverted Oscillator
Praloy Das, Subir Ghosh
A recent conjecture of Morita predicts a lower bound in temperature of a chaotic system, , being the Lyapunov exponent, which was demonstrated for a one…
Thermodynamics and Phase Transition in Shapere-Wilczek {\it fgh} model: Cosmological Time Crystal in Quadratic Gravity
Praloy Das, Supriya Pan, Subir Ghosh
The Shapere-Wilczek model \cite{wil}, or so called model, enjoys the remarkable features of a Time Crystal (TC) that has a non-trivial time dependence in its lowest energy s…
Back Reaction Inhomogeneities in Cosmological Parameter Evolution via Noncommutative Fluid
Praloy Das, Subir Ghosh
The paper discusses back reaction effects in cosmology, (á la Buchert et. al.), induced by noncommutative geometry effects in fluid. We have used generalizations of an action formu…
Cosmological Time Crystal: Cyclic Universe with a small in a toy model approach
Praloy Das, Supriya Pan, Subir Ghosh +1
A new form Time Crystal has been proposed and some of its consequences have been studied. The model is a generalization of the Friedmann-Robertson-Walker (FRW) cosmology endowed wi…
Galilei Group with multiple central extension, vorticity and entropy generation: "Exotic" fluid in 3+1-dimensions
Praloy Das, Subir Ghosh
A noncommutative extension of an ideal (Hamiltonian) fluid model in -dimensions is proposed. The model enjoys several interesting features: it allows a multi-parameter central…
Motion of charged particle in Reissner-Nordstrom spacetime: A Jacobi metric approach
Praloy Das, Ripon Sk, Subir Ghosh
The present work discusses motion of neutral and charged particles in Reissner - Nordstrom spacetime. The constant energy paths are derived in a variational principle framework usi…
Noncommutative Geometry and Fluid Dynamics
Praloy Das, Subir Ghosh
In the present paper we have developed a Non-Commutative (NC) generalization of perfect fluid model from first principles, in a Hamiltonian framework. The noncommutativity is intro…
Particle on a Torus Knot: Constrained Dynamics and Semi-Classical Quantization in a Magnetic Field
Praloy Das, Souvik Pramanik, Subir Ghosh
Kinematics and dynamics of a particle moving on a torus knot poses an interesting problem as a constrained system. In the first part of the paper we have derived the modified sympl…
Particle on a torus knot: a Hamiltonian analysis
Praloy Das, Subir Ghosh
We have studied the dynamics and symmetries of a particle constrained to move in a torus knot. The Hamiltonian system turns out to be Second Class in Dirac's formulation and the Di…
Analogue White Hole Horizon and its Impact on Sediment Transport
Debasmita Chatterjee, Praloy Das, Subir Ghosh +1
Motivated by the ideas of analogue gravity, we have performed experiments in a flume where an analogue White Hole horizon is generated, in the form of a wave blocking region, by su…