Talk detail

Participant	Werner, Marcus C.
Institution	Kyoto University, Yukawa Institute for Theoretical Physics - Kitashirakawa Oiwakecho, Sakyo-ku - Kyoto - Kyoto-fu - Japan

Session	PT2	Accepted		Order	Time
Talk	Oral abstract	Title	A geometrical approach to gravitational lensing magnification
Coauthors
Abstract	The recent discoveries of strongly lensed type Ia supernovae yielded the first direct measurements of image magnifications in gravitational lensing. As magnification is thus becoming an important observable, it is also desirable to gain a better theoretical understanding of this concept beyond its usual formulation in the quasi-Newtonian approximation. In this talk, I will describe how the standard definition of gravitational lensing magnification may be generalized to Lorentzian spacetimes, and show how this definition can be interpreted geometrically in terms of the van Vleck determinant and the exponential map. Applications will also be discussed.
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