Extracting information on black hole horizons
Pugliese D. Quevedo H.
November 2021Elsevier B.V.
Nuclear Physics B
2021#972
We present some features of Kerr black hole horizons that are replicated on orbits accessible to outside observers. We use the concepts of horizon confinement and replicas to show that outside the outer horizon there exist photon orbits whose frequencies contain information about the inner horizon and that can, in principle, be detected through the emission spectra of black holes. It is shown that such photon orbits exist close to the rotation axis of the Kerr geometry. We argue that these results could be used to recognize and further investigate black holes and their horizons.
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Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, Bezručovo náměstí 13, Opava, CZ-74601, Czech Republic
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, AP 70543, México, 04510, DF, Mexico
Dipartimento di Fisica and ICRA, Università di Roma “La Sapienza”, Roma, I-00185, Italy
Department of Theoretical and Nuclear Physics, Kazakh National University, Almaty, 050040, Kazakhstan
Research Centre for Theoretical Physics and Astrophysics
Instituto de Ciencias Nucleares
Dipartimento di Fisica and ICRA
Department of Theoretical and Nuclear Physics
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