Viewing Black Holes by Waves

Understand

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.