Gravomagnetic tensing by NUT space

被引:45
作者
Nouri-Zonoz, M [1 ]
Lynden-Bell, D [1 ]
机构
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
关键词
gravitation; magnetic fields; relativity; gravitational lensing;
D O I
10.1093/mnras/292.3.714
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using the fact that the null geodesics in NUT space lie on spatial cones, we consider the gravomagnetic lens effect on light rays passing an NUT deflector. We show that this effect changes the observed shape, size and orientation of a source. Compared with the Schwarzschild lens. there is an extra shear (a differential twist around the lens axis) due to the gravomagnetic field which shears the shape of the source. Gravomagnetic monopoles can thus be recognized by the spirality that they produce in the lensing pattern. All the results obtained in this case (magnification factor, orientation of images, multiplicity of images, etc.) depend on Q, the strength of the gravomagnetic monopole represented by the NUT metric. One recovers the results of the usual Schwarzschild lens effect by setting this factor equal to zero.
引用
收藏
页码:714 / 722
页数:9
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