Strong deflection gravitational lensing: basic aspects and recent progress (presentación oral, expositor)

ERNESTO F. EIROA

Villa General Belgrano, Córdoba

Conferencia; Grav13; 2013

FAMAF, Universidad de Córdoba, Argentina

Compact astrophysical objects like black holes strongly curve the spacetime in their vicinity. If an object with a photon sphere is between a source of electromagnetic radiation and an observer, in addition to the usual primary and secondary images due to small deflections of the light rays, there are two infinite sets of images called relativistic, produced by light passing close to the photon sphere, which undergoes a large deflection. The positions and magnifications of relativistic images can be obtained numerically or analytically. The analytical lensing calculations are performed by using an approximate method called strong deflection limit, which is applied to the study of non-rotating black holes and also to rotating ones. In the latter case, is also of interest to study the deformation of the shadow cast by the black hole, which grows with the rotation parameter. The purpose of this talk is to review the basics and the recent advances on strong deflection gravitational lensing.