A Cusp—Counting Formula For Caustics Due To Multiplane Gravitational Lensing
1996 ◽
Vol 173
◽
pp. 281-282
Keyword(s):
Consider a gravitational lens system with K planes. If light rays are traced back from the observer to the light source plane, then the points on the first lens plane where a light ray either terminates, or, passes through and terminates before reaching the light source plane, are “obstruction points.” More precisely, tracing rays back to the source plane induces a K-plane lensing map η : U ⊆ R2 → R2 of the form η(x1) = x1 −∑i=1k αi(xi(xi)). We then define an obstruction point of η to be a point a of U where limx1→a |αi(xi(x1))| = ∞ for some “deflection angle” αi.
Keyword(s):
Keyword(s):
2021 ◽
2019 ◽
2020 ◽
Vol 499
(4)
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pp. 5641-5652
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Vol 14
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pp. 19-23
2000 ◽
Vol 104
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pp. 971-980
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pp. 128-135
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Vol 501
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pp. 475-484
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