[astroseminar at Sapienza] 22/10/2018 at 15:30: Gennadi Bisnovatyi-Kogan

[Elia Battistelli]

Title: Gravitational lensing and black hole shadow
Speaker:   Gennadi Bisnovatyi-Kogan
Institution: Space Research Institute - Russuan Academy of Science, 
Moscow
Date: Monday, 22 October 2018
Time: 3:30pm
Location: Aula Rasetti, Marconi Building, Dept. of Physics, Sapienza 
University

Abstract:
An overview of the developments in problems of the effects of 
gravitational lensing is given, including plasma influence. Deflection 
of light in the presence of gravity and plasma is determined by a 
complex combination of various physical phenomena: gravity, dispersion, 
refraction. In particular, the gravitational deflection itself, in a 
homogeneous plasma without refraction, differs from the vacuum one and 
depends on the frequency of the photon. In an inhomogeneous plasma, 
chromatic refraction also takes place. We describe chromatic effects in 
strong lens systems including a shift of angular position of image and a 
change in
magnification.

web: https://agenda.infn.it/conferenceDisplay.py?confId=17027