Rotating black holes twist photons emitted nearby, a peculiar effect in general relativity that is now demonstrated by numerical experiments. This twisted light and its orbital angular momentum could reveal the physics of black holes in more detail than deemed possible before.
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Bojowald, M. A twist on relativistic astrophysics. Nature Phys 7, 188–189 (2011). https://doi.org/10.1038/nphys1938
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DOI: https://doi.org/10.1038/nphys1938