PREDNASAJUCI / LECTURER :
Univ.-Prof. Dr.phil Arnold Hanslmeier

NAZOV / TITLE :
Gravitational lensing  - a tool for detecting matter

ABSTRAKT / ABSTRACT :
General relativity theory predicts a curvature of space time. This depends
on the distribution of mass and therefore by measuring the deflection of
light we can get information about the distribution of mass.
In the first part of this seminar an overview on the basic principles
based on Einstein’s field equations is done then we present the cases of
strong lensing, weak lensing and microlensing. Finally we give examples of
own observations made at the observatory del Teide ( 1m Francisco Sanchez
Telescope) and Roque de los Muchachos (4.2 m W. Herschel and 10.4 m
GranTECAN) of Quasar observations revealing strong lensing as well as
microlensing and show especially how microlensing can be used as a
diagnostics tool for the lensing galaxy cluster and the accretion disc of
the Quasar behind.