594 citations · 3.1k across the 88 of their papers we have counts for
5 papers · 1 filter
Bulk spacetimes for cosmological braneworlds with a time--dependent extra dimension
Suman Ghosh, Sayan Kar
We explore the possibilities of constructing bulk spacetimes in five dimensions for warped braneworld models with a spatially flat Friedmann-Robertson-Walker (FRW) line element on…
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)…
Particle creation in the presence of a warped extra dimension
Suman Ghosh, Sayan Kar
Particle creation in spacetimes with a warped extra dimension is studied. In particular, we investigate the dynamics of a conformally coupled, massless scalar field in a five dimen…
Stable two--brane models with bulk tachyon matter
A. Das, Sayan Kar, Soumitra SenGupta
We explore the possibility of constructing stable, warped two--brane models which solve the hierarchy problem, with a bulk non--canonical scalar field (tachyon matter) as the sourc…