Shadows and lensing of black holes immersed in strong magnetic fields

Abstract

We investigate the null geodesic flow and in particular the light rings (LRs), fundamental photon orbits (FPOs) and shadows of a black hole (BH) immersed in a strong, uniform magnetic field, described by the Schwarzschilld-Melvin electrovacuum solution. The empty Melvin magnetic Universe contains a tube of planar LRs. Including a BH, for weak magnetic fields, the shadow becomes oblate, whereas the intrinsic horizon geometry becomes prolate. For strong magnetic fields (over-critical solutions), there are no LRs outside the BH horizon, a result explained using topological arguments. This feature, together with the light confining structure of the Melvin Universe yields \textit{panoramic shadows}, seen (almost) all around the equator of the observer's sky. Despite the lack of LRs, there are FPOs, including polar planar ones, which define the shadow edge. We also observe and discuss chaotic lensing, including in the empty Melvin Universe, and multiple disconnected shadows.

Matches the version published in Physical Review D, typos corrected, 17 pages, 11 figures

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• Light Deflection Angle by Superentropic Black Holes
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• The Influence of Uniform Magnetic Fields on Strong Field Gravitational Lensing by Kerr Black Holes
• Superentropic Black Hole Shadows in Arbitrary Dimensions
• Shadow behavior of an EMSG charged black hole
• Exploring light deflection and black hole shadows in Rastall theory with plasma effects
• Spin-induced scalarization and magnetic fields
• Determination of the spin parameter and the inclination angle by the relativistic images in black hole image
• Explicit symplectic integrators with adaptive time steps in curved spacetimes
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• Traces of quantum fuzziness on the black hole shadow and particle deflection in the multi-fractional theory of gravity
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• The surface geometry and shadow of a Schwarzschild black hole with halo
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• Lensing, Shadow and Photon Rings in a Magnetized Black Hole Spacetime
• QED Effects on Kerr Black Hole Shadows immersed in uniform magnetic fields
• Topological charge and black hole photon spheres in massive gravity
• Two shadows of a single black hole: Vacuum birefringence phenomena within Einstein-nonlinear-electrodynamics
• Stable photon orbits in stationary axisymmetric spacetimes with an electromagnetic field and a cosmological constant
• Multi-ring images of thin accretion disk of a regular naked compact object