594 citations · 3.1k across the 88 of their papers we have counts for
45 papers · 1 filter
Closed strings in a class of pp-wave spacetimes and the memory effect
Ayan Dey, Sayan Kar
We study closed string evolution in the pp-wave spacetime assuming different pulse shapes (square and sech-squared) in the exact gravitational wave metric. It is shown that the sha…
Novel regular black holes: geometry, source and shadow
Anjan Kar, Sayan Kar
We propose a two-parameter, static and spherically symmetric regular geometry, which, for specific parameter values represents a regular black hole. The matter required to support…
Shadows in dyonic Kerr-Sen black holes
Soumya Jana, Sayan Kar
Black holes with dyonic charges in Einstein-Maxwell-dilaton-axion supergravity theory are revisited in the context of black hole shadows. We consider static as well as rotating (na…
Generalised Hayward spacetimes: Geometry, matter and scalar quasinormal modes
Poulami Dutta Roy, Sayan Kar
Bardeen's 1968 idea of a regular black hole spacetime was revived by Hayward in 2006 through the construction of a new example of such a geometry. Later it was realised by Neves an…
A simple analytic example of the gravitational wave memory effect
Indranil Chakraborty, Sayan Kar
We report an analytical example of the gravitational wave memory effect in exact plane wave spacetimes. A square pulse profile is chosen which gives rise to a curved wave region sa…
Wormholes with a warped extra dimension?
Sayan Kar
We investigate the role of a specifically warped extra dimension in constructing examples of higher dimensional spacetimes representing Lorentzian wormholes. The warping chosen is…