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Gravitational Lensing by Black Holes with Multiple Photon Spheres

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arxiv 2204.13948 v2 pith:32KEH6E7 submitted 2022-04-29 gr-qc hep-th

Guangzhou Guo , Xin Jiang , Peng Wang , Houwen Wu This is my paper
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keywords photonspheresblackimagescelestialcriticalgravitationalhigher-order
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We study gravitational lensing of light by hairy black holes, which, in a certain parameter regime, can possess two photon spheres of different size outside the event horizon. In particular, we focus on higher-order images of a point-like light source and a luminous celestial sphere produced by strong gravitational lensing near photon spheres. Two photon spheres usually triple the number of high-order images of a point-like light source. When a hairy black hole is illuminated by a celestial sphere, two photon spheres would give rise to two critical curves in the black hole image, and the smaller critical curve coincides with the shadow edge. In addition to a set of higher-order images of the celestial sphere outside the shadow edge, two more sets of higher-order images are observed inside and outside the larger critical curve, respectively.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Critical Behavior of Photon Rings in Kerr-Bertotti-Robinson Spacetime

    gr-qc 2026-03 conditional novelty 6.0 of 10

    For a magnetized Kerr-Bertotti-Robinson black hole, the photon-ring parameters gamma, delta, and tau all decrease compared with the unmagnetized Kerr case, weakening the self-similar stacking of higher-order images.

  2. Spin-induced Scalarized Black Holes in Einstein-Maxwell-scalar Models

    gr-qc 2025-06 conditional novelty 6.0 of 10

    Spin-induced scalarized Kerr-Newman black holes are constructed numerically for negative coupling, and they coexist with stable, entropically favored Kerr-Newman black holes.

  3. Gravitational Lensing by Black Holes in Einstein-nonlinear Electrodynamic Theories with Multiple Photon Spheres

    gr-qc 2025-07 conditional novelty 4.0 of 10

    In Einstein-nonlinear electrodynamic black holes, each effective potential peak that is taller than all peaks outside it yields a separate photon ring cluster in the lensed image, and triple-peak cases show three nest...

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