134 citations · 354 across the 6 of their papers we have counts for
6 papers · 1 filter
Conservation of distortion of gravitationally lensed images
K. S. Virbhadra
We recently hypothesized that a distortion parameter exists such that its signed sum for all images of singular gravitational lensing of a source vanishes identically [K. S. Virbha…
Cosmological constant corrections to the photon sphere and black hole shadow radii
Stephen L. Adler, K. S. Virbhadra
We review the equations determining the photon sphere radius and the black hole shadow radius, and calculate the cosmological constant corrections arising when the dark energy acti…
Distortions of images of Schwarzschild lensing
K. S. Virbhadra
We model the supermassive dark object as a Schwarzschild lens and study the variations in tangential, radial, and total (the product of tangential and radial) magnification…
Compactness of supermassive dark objects at galactic centers
K. S. Virbhadra
We define compactness of a gravitational lens as the scaled closest distance of approach (i.e., ) of the null geodesic giving rise to an image. We model forty supermassive d…
Energy and momentum of cylindrical gravitational waves. II
K. S. Virbhadra
Recently Nathan Rosen and the present author obtained the energy and momentum densities of cylindrical gravitational waves in Einstein's prescription and found them to be finite an…
Gravitational and electromagnetic fields of a charged tachyon
K. S. Virbhadra
An axially symmetric exact solution of the Einstein-Maxwell equations is obtained and is interpreted to give the gravitational and electromagnetic fields of a charged tachyon. Swit…