197 citations · 467 across the 18 of their papers we have counts for
5 papers · 1 filter
Kinematics of deformable media
Anirvan Dasgupta, Hemwati Nandan, Sayan Kar
We investigate the kinematics of deformations in two and three dimensional media by explicitly solving (analytically) the evolution equations (Raychaudhuri equations) for the expan…
Gravitational lensing in braneworld gravity: formalism and applications
Supratik Pal, Sayan Kar
In this article, we develop a formalism which is different from the standard lensing scenario and is necessary for understanding lensing by gravitational fields which arise as solu…
Can degenerate bound states occur in one dimensional quantum mechanics?
Sayan Kar, Rajesh R. Parwani
We point out that bound states, degenerate in energy but differing in parity, may form in one dimensional quantum systems even if the potential is non-singular in any finite domain…
Focusing of branes in warped backgrounds
Sayan Kar
Branes are embedded surfaces in a given background (bulk) spacetime. Assuming a warped bulk, we investigate, in analogy with the case for geodesics, the notion of {\em focusing} of…
de Sitter branes with a bulk scalar
Supratik Pal, Sayan Kar
We propose new braneworld models arising from a scalar field in the bulk. In these examples, the induced on--brane line element is de Sitter (or anti de Sitter) and the bulk (five…