Description
After some historical remarks, observational data on the gravitational lensing are given different types of lensing: strong, weak, and microlensing, discovery of planets around distant stars by microlensing. Lensing is considered with large deviation angles, when light passes close to the gravitational radius of the lens, and formation of weak relativistic rings. Influence of plasma on the gravitational lensing surrounding a gravitating body on lensing is considered.
A lensing angle in the uniform plasma depends on the frequency of the electromagnetic wave, due to dispersion properties of plasma. Statistical properties of gamma ray bursts with account of gravitational lensing are discussed, including influence of GRB beaming.
Auteur principal
Prof.
Genna BISNOVATYI-KOGAN
(Space Research Institute, Moscow)
