Millimetre-wavelength interferometry and gravitational-wave detectors currently provide the most stringent tests for the existence of cosmic black holes. Complementary measurements of magnetic fields near their event horizon would be decisive.
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Lobanov, A. Beyond the event horizon or altogether without it?. Nat Astron 1, 0069 (2017). https://doi.org/10.1038/s41550-017-0069
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DOI: https://doi.org/10.1038/s41550-017-0069
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