Gravomagnetic Lensing by NUT Space

Details Gravomagnetic Lensing by NUT Space Gravomagnetic Lensing by NUT Space

1998-12-30

arxiv.org/abs/gr-qc/9812094v1

Mon. Not. R. Astron. Soc. 292, (1997)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

29 pages including 15 figures, MNRAS format

Scientific paper

Using the fact that the null geodesics in NUT space lie on spatial cones, we consider the gravomagnetic lens effect on light rays passing a NUT deflector. We show that this effect changes the observed shape, size and orientation of a source. Compared to 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 NUT metric. One recovers the results of the usual Schwarzschild lens effect by putting this factor equal to zero.

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