Abstract
We study the set of trapped photons of a subcritical (\(a<M\)) Kerr spacetime as a subset of the phase space. First, we present an explicit proof that the photons of constant Boyer–Lindquist coordinate radius are the only photons in the Kerr exterior region that are trapped in the sense that they stay away both from the horizon and from spacelike infinity. We then proceed to identify the set of trapped photons as a subset of the (co-)tangent bundle of the subcritical Kerr spacetime. We give a new proof showing that this set is a smooth 5-dimensional submanifold of the (co-)tangent bundle with topology \(SO(3)\times {\mathbb {R}}^2\) using results about the classification of 3-manifolds and of Seifert fiber spaces. Both results are covered by the rigorous analysis of Dyatlov (Commun Math Phys 335(3):1445–1485, 2015); however, the methods we use are very different and shed new light on the results and possible applications.
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20 November 2019
The proof of Theorem 10 can be considerably simplified, as was pointed out to us by Gregory J.
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Acknowledgements
We would like to thank Pieter Blue and András Vasy for useful comments. Furthermore, we thank Oliver Schön for generating the figures for this article. This work is supported by the Institutional Strategy of the University of Tübingen (Deutsche Forschungsgemeinschaft, ZUK 63).
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Cederbaum, C., Jahns, S. Geometry and topology of the Kerr photon region in the phase space. Gen Relativ Gravit 51, 79 (2019). https://doi.org/10.1007/s10714-019-2561-y
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DOI: https://doi.org/10.1007/s10714-019-2561-y