30 citations · 125 across the 7 of their papers we have counts for
7 papers
Evolution of geodesic congruences in a gravitationally collapsing scalar field background
Rajibul Shaikh, Sayan Kar, Anirvan DasGupta
The evolution of timelike geodesic congruences in a spherically symmetric, nonstatic, inhomogeneous spacetime representing gravitational collapse of a massless scalar field is stud…
Kinematics of trajectories in classical mechanics
Rajibul Shaikh, Sayan Kar, Anirvan DasGupta
In this paper, we show how the study of kinematics of a family of trajectories of a classical mechanical system may be unified within the framework of analysis of geodesic flows in…
Geodesic flows in rotating black hole backgrounds
Anirvan DasGupta, Hemwati Nandan, Sayan Kar
We study the kinematics of timelike geodesic congruences, in the spacetime geometry of rotating black holes in three (the BTZ) and four (the Kerr) dimensions. The evolution (Raycha…
Geodesic congruences in warped spacetimes
Suman Ghosh, Anirvan Dasgupta, Sayan Kar
In this article, we explore the kinematics of timelike geodesic congruences in warped five dimensional bulk spacetimes, with and without thick or thin branes. Beginning with geodes…
Kinematics of geodesic flows in stringy black hole backgrounds
Anirvan Dasgupta, Hemwati Nandan, Sayan Kar
We study the kinematics of timelike geodesic congruences in two and four dimensions in spacetime geometries representing stringy black holes. The Raychaudhuri equations for the kin…
Kinematics of flows on curved, deformable media
Anirvan Dasgupta, Hemwati Nandan, Sayan Kar
In this article, we first investigate the kinematics of specific geodesic flows on two dimensional media with constant curvature, by explicitly solving the evolution (Raychaudhuri)…