Interferometry of black holes with Hawking radiation

Understand

We investigate the wave optical imaging of black holes with Hawking radiation.

• The spatial correlation function of Hawking radiation is expressed in terms of transmission and reflection coefficients for scalar wave modes and evaluated by numerically summing over angular quantum numbers for the Unruh-Hawking state of the Kerr-de Sitter black hole.
• Then, wave optical images of an evaporating black hole are obtained by the Fourier transformation of the spatial correlation function.
• For short wavelength, the image of the black hole with the outgoing mode of the Unruh-Hawking state has the appearance of a star with its surface given by the photon sphere.