Naoki Tsukamoto, Tomohiro Harada
It is well known that the mass lens systems have the invariance in the singed magnification sums. In this paper, we discuss the signed magnification sums of the general spherical lens models including the singular isothermal sphere, the Schwarzschild black hole and the Ellis wormhole which is an example of the transversable wormholes of the Morris-Thorne class. We show that the signed magnification sum is a very useful tool to distinguish the exotic lens objects. For an example, we show that we can distinguish the Schwarzschild black hole with the Ellis wormhole by the signed magnification sum.
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http://arxiv.org/abs/1211.0380
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