Twisting of light around rotating black holes

Details Twisting of light around rotating black holes Twisting of light around rotating black holes

2011-04-15

arxiv.org/abs/1104.3099v1

Nature Phys.7:195-197,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Article: 18 pages (11 pages in form of an Appendix). Total number of figures: 5

Scientific paper

10.1038/nphys1907

Kerr black holes are among the most intriguing predictions of Einstein's general relativity theory. These rotating massive astrophysical objects drag and intermix their surrounding space and time, deflecting and phase-modifying light emitted nearby them. We have found that this leads to a new relativistic effect that imposes orbital angular momentum onto such light. Numerical experiments, based on the integration of the null geodesic equations of light from orbiting point-like sources in the Kerr black hole equatorial plane to an asymptotic observer, indeed identify the phase change and wavefront warping and predict the associated light-beam orbital angular momentum spectra. Setting up the best existing telescopes properly, it should be possible to detect and measure this twisted light, thus allowing a direct observational demonstration of the existence of rotating black holes. Since non-rotating objects are more an exception than a rule in the Universe, our findings are of fundamental importance.

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