Photon rings in a holographic toy model
Sign Up to like & getrecommendations! Published in 2025 at "Journal of High Energy Physics"
DOI: 10.1007/jhep10(2025)229
Abstract: Light circling around an astrophysical black hole can spend a long time skirting its unstably bound photon orbits before escaping to infinity. To a distant observer, this orbiting light would appear as a bright ring… read more here.
Keywords: black hole; photon ring; toy model; photon ... See more keywords
Photon ring structure of rotating regular black holes and no-horizon spacetimes
Sign Up to like & getrecommendations! Published in 2021 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/abdd48
Abstract: The Kerr black holes possess a photon region with prograde and retrograde orbits radii, respectively, M⩽rp−⩽3M and 3M⩽rp+⩽4M , and thereby always cast a closed photon ring or a shadow silhouette for a ⩽ M.… read more here.
Keywords: black holes; closed photon; photon ring; horizon spacetimes ... See more keywords
Photon Ring Astrometry for Superradiant Clouds.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review letters"
DOI: 10.1103/physrevlett.130.111401
Abstract: Gravitational atoms produced from the superradiant extraction of rotational energy of spinning black holes can reach energy densities significantly higher than that of dark matter, turning black holes into powerful potential detectors for ultralight bosons.… read more here.
Keywords: superradiant clouds; photon ring; astrometry superradiant; ring astrometry ... See more keywords