The Basics of Lensing

Cosmological Applications of Gravitational Lensing

The last decade has seen an enormous increase of activity in the eld of gravitational lensing, mainly driven by improvements of observational capabilities. I will review the basics of gravitational lens theory, just enough to understand the rest of this contribution, and will then concentrate on several of the main applications in cosmology. Cluster lensing, and weak lensing, will constitute th...

Gravitational Lensing a Universal Astrophysical Tool

In the roughly 20 years of its existence as an observational science, gravitational lensing has established itself as a valuable tool in many astrophysical fields. In the introduction of this review we briefly present the basics of lensing. Then it is shown that the two propagation effects, lensing and scintillation, have a number of properties in common. In the main part various lensing phenom...

Quasar Lensing : the Observer ’ s Point of View

The determination of the Hubble parameter H 0 is probably one of the most important applications of quasar lensing. The method, based on the measurement of the so-called " time-delay " between the lensed images of distant sources, e.g., quasars, and on detailed mass mod-eling of the potential well responsible for the multiple images, yields an accuracy at least comparable with other techniques ...

Inevitable Orders: A Critique of The Basics of Mythology, Kobra Bahmani

Explanation of Theoretical Basics of Analysis of the World Order