Speaker
Dr
De-Chang Dai
(National Dong Hwa University)
Description
We study the retrograde second caustics of extremal Kerr black holes, where the intensity of the light beam is infinitely magnified. We find that the caustics of different polarized beams are split by as much as 10−3 rad by an external black hole for a suitable range of parameters. A lensing black hole at several lys away separates the polarized beams about 1012 m apart. This splitting is larger than the radius of the Earth. Therefore, an observer on Earth would see different circularly polarized light according to their location. The polarization will change while the detector is wandering around. Thus, the polarization of light beams can be an important quantity in retrolensing observations.
| Research Area | Gravity: Geometric theory |
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Author
Dr
De-Chang Dai
(National Dong Hwa University)