TL;DR
This paper numerically analyzes wave scattering by Schwarzschild black holes, reconstructs wave optical images, and identifies characteristic rings linked to photon orbits, enhancing understanding of black hole imaging.
Contribution
It introduces a numerical method for wave scattering and imaging of black holes, revealing wave optical features related to photon orbits.
Findings
Wave scattering data produce rings in images at specific angles.
Images show black hole glories associated with photon orbits.
Numerical reconstruction of black hole images from wave data is demonstrated.
Abstract
We study scattering of waves by black holes. Solving a massless scalar field with a point source in the Schwarzschild spacetime, waves scattered by the black hole is obtained numerically. We then reconstruct images of the black hole from scattered wave data for specified scattering angles. For the forward and the backward directions, obtained wave optical images of black holes show rings that correspond to the black hole glories associated with existence of the unstable circular photon orbit in the Schwarzschild spacetime.
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