Gravomagnetic lensing by NUT space

Details Gravomagnetic lensing by NUT space Gravomagnetic lensing by NUT space

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..714n&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 714

Astronomy and Astrophysics

Astronomy

12

Gravitational Lenses, Light Beams, Interstellar Magnetic Fields, Schwarzschild Metric, Image Analysis, Monopoles

Scientific paper

Using the fact that the null geodesics in Newman, Unti and Tamburino (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 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.

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