120 citations · 605 across the 50 of their papers we have counts for
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Hardness and approximation for the geodetic set problem in some graph classes
Dibyayan Chakraborty, Florent Foucaud, Harmender Gahlawat +2
In this paper, we study the computational complexity of finding the \emph{geodetic number} of graphs. A set of vertices of a graph is a \emph{geodetic set} if any vertex of…
Hawking radiation in a non-covariant frame: the Jacobi metric approach
Avijit Bera, Subir Ghosh, Bibhas Ranjan Majhi
The present paper deals with a reformulation of the derivation of Hawking temperature for static and stationary black holes. In contrast to the conventional approach, where the cov…
Geometric Phases for Classical and Quantum Dynamics: Hannay angle and Berry Phase for Loops on a Torus
Subir Ghosh
In this paper we have considered closed trajectories of a particle on a two-torus where the loops are noncontractible (poloidal and toroidal loops and knots embedded on a regular t…
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…
Observational constraints of a new unified dark fluid and the tension
Weiqiang Yang, Supriya Pan, Andronikos Paliathanasis +2
Unified cosmological models have received a lot of attention in astrophysics community for explaining both the dark matter and dark energy evolution. The Chaplygin cosmologies, a w…
On conflict-free chromatic guarding of simple polygons
Onur Çağırıcı, Subir Kumar Ghosh, Petr Hliněný +1
We study the problem of colouring the vertices of a polygon, such that every viewer in it can see a unique colour. The goal is to minimise the number of colours used. This is also…