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• W3098982568 abstract "We investigate the caustic topologies for binary gravitational lenses made up of two objects whose gravitational potential declines as $1/r^n$. With $n<1$ this corresponds to power-law dust distributions like the singular isothermal sphere. The $n>1$ regime can be obtained with some violations of the energy conditions, one famous example being the Ellis wormhole. Gravitational lensing provides a natural arena to distinguish and identify such exotic objects in our Universe. We find that there are still three topologies for caustics as in the standard Schwarzschild binary lens, with the main novelty coming from the secondary caustics of the close topology, which become huge at higher $n$. After drawing caustics by numerical methods, we derive a large amount of analytical formulae in all limits that are useful to provide deeper insight in the mathematics of the problem. Our study is useful to better understand the phenomenology of galaxy lensing in clusters as well as the distinct signatures of exotic matter in complex systems." @default.
• W3098982568 created "2020-11-23" @default.
• W3098982568 creator A5002654803 @default.
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• W3098982568 date "2016-03-22" @default.
• W3098982568 modified "2023-09-30" @default.
• W3098982568 title "Caustics of 1/<i>r</i>^<i>n</i>binary gravitational lenses: from galactic haloes to exotic matter" @default.
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• W3098982568 doi "https://doi.org/10.1088/1475-7516/2016/03/040" @default.
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