Mathematics of gravitational lensing: Multiple imaging and magnification. (English) Zbl 1197.83006

Summary: The mathematical theory of gravitational lensing has revealed many generic and global properties. Beginning with multiple imaging, we review Morse-theoretic image counting formulas and lower bound results, and complex-algebraic upper bounds in the case of single and multiple lens planes. We discuss recent advances in the mathematics of stochastic lensing, discussing a general formula for the global expected number of minimum lensed images as well as asymptotic formulas for the probability densities of the microlensing random time delay functions, random lensing maps, and random shear, and an asymptotic expression for the global expected number of micro-minima. Multiple imaging in optical geometry and a spacetime setting are treated. We review global magnification relation results for model-dependent scenarios and cover recent developments on universal local magnification relations for higher order caustics.


83-02 Research exposition (monographs, survey articles) pertaining to relativity and gravitational theory
83C10 Equations of motion in general relativity and gravitational theory
85-02 Research exposition (monographs, survey articles) pertaining to astronomy and astrophysics
85A05 Galactic and stellar dynamics
37N20 Dynamical systems in other branches of physics (quantum mechanics, general relativity, laser physics)
53Z05 Applications of differential geometry to physics


MultiPlane; GAUDI
Full Text: DOI arXiv


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