The Black Hole Explorer: Using the Photon Ring to Visualize Spacetime Around the Black Hole

2); (2) Center for Astrophysics | Harvard; (3) Department of Physics & Astronomy; Alexandru Lupsasca (3); Michael D. Johnson (1; Peter Galison (1); Roman Berens (3) ((1) Black Hole Initiative at Harvard University; Smithsonian; Trevor Gravely (3); Vanderbilt University)

The Black Hole Explorer: Using the Photon Ring to Visualize Spacetime Around the Black Hole

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arxiv 2406.11671 v1 pith:6B6T52W2 submitted 2024-06-17 gr-qc

Peter Galison (1) , Michael D. Johnson (1 , 2) , Alexandru Lupsasca (3) , Trevor Gravely (3) , Roman Berens (3) ((1) Black Hole Initiative at Harvard University , (2) Center for Astrophysics | Harvard , Smithsonian

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(3) Department of Physics & Astronomy Vanderbilt University)

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keywords blackholephotonringaroundbhexexplorermillimeter

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The Black Hole Explorer (BHEX), an orbiting, multi-band, millimeter radio-telescope, in hybrid combination with millimeter terrestrial radio-telescopes, is designed to discover and measure the thin photon ring around the supermassive black holes M87* and Sgr A*. As background to the BHEX instruments, this paper explores various aspects of the photon ring, focusing on the intricate flow of light around a spinning black hole, and tracking, through visual simulations, photons as they course along geodesics. Ultimately, the aim of these visualizations is to advance the foundational aims of the BHEX instrument, and through this experiment to articulate spacetime geometry via the photon ring.

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