31 citations · 52 across the 7 of their papers we have counts for
7 papers
Gravitational Lensing in the Schwarzschild Spacetime: Photon Rings in Vacuum and in the Presence of a Plasma
Torben C. Frost
Astrophysical black holes are usually surrounded by an accretion disk. At least parts of these accretion disks consist of a plasma in which light rays with different energies are d…
Magnification of Classical Multimessenger Signals in Stationary and Axisymmetric Spacetimes with Separable Equations of Motion
Torben C. Frost
When photons, gravitational waves, and massive particles such as neutrinos are gravitationally lensed the signals detected by telescopes or detectors on and around Earth are usuall…
Gravitational Lensing in the Kerr Spacetime: An Analytic Approach for Light and High-Frequency Gravitational Waves
Torben C. Frost
The Kerr spacetime is one of the most widely known solutions to Einstein's vacuum field equations and is commonly used to describe a black hole with mass and spin . Astrophy…
Gravitational Lensing of Massive Particles in the Charged NUT Spacetime
Torben C. Frost
In astronomy, gravitational lensing of light leads to the formation of multiple images, arcs, Einstein rings, and, most important, the shadow of black holes. Analogously in the vic…
Gravitational Lensing in the Charged NUT-de Sitter Spacetime
Torben C. Frost
It is a long-standing open question if a gravitomagnetic charge, the gravitational analogon to a hypothetical magnetic charge in electrodynamics, exists in nature. It naturally occ…
Gravitational Lensing by Charged Accelerating Black Holes
Torben C. Frost
Current astrophysical observations show that on large scale the Universe is electrically neutral. However, locally this may be quite different. Black holes enveloped by a plasma in…
Lightlike Geodesics and Gravitational Lensing in the Spacetime of an Accelerating Black Hole
Torben C. Frost, Volker Perlick
The C-metric is a solution to Einstein's vacuum field equation that describes an accelerating black hole. In this paper we discuss the propagation of light rays and the resulting l…