Black Hole Shadow with Soft Hair

Abstract

Light bending by the strong gravity around the black hole will form the so-called black hole shadow, the shape of which can shed light on the structure of the near-horizon geometry to possibly reveal novel physics of strong gravity and black hole. In this work, we adopt both analytical and ray-tracing methods to study the black hole shadow in the presence of the infrared structure of gravity theory, which manifests the asymptotic symmetries of spacetime as the supertranslation soft hairs of the black hole. Though the black hole metrics with and without the soft hair are related by large gauge transformations, the near horizon geometries relevant for the shape of the shadow are quite different. Moreover, the Hamiltonian for the geodesic seems intrinsically different, i.e., the loss of separability due to the breaking of spherical symmetry by soft hair. By applying ray-tracing computations, we find that the soft hair, although not affecting the shape of the shadow, may change the average size and position of the shadow. Images resulting from soft hair black holes with surrounding accretion flows are also discussed.

arXiv comment28 pages, 11 figures, including analytical calculation of shadow without any change in final conclusion, matches with the version accepted by JHEP

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• A review on analytical studies in Gravitational Lensing
• Observational Appearances of Magnetically Charged Black Holes in Born-Infeld Electrodynamics
• Study of relativistic accretion flow around KTN black hole with shocks
• The Shadow of Supertranslated Schwarzschild Black Hole
• Observational features of reflection asymmetric black holes
• Photon ring autocorrelations from gravitational fluctuations around a black hole
• Shadow of quadrupole-deformed compact objects in a local dark matter shell
• Conic Sections on the Sky: Shadows of Linearly Superrotated Black Holes
• Anomaly Equation of the Large U(1) Chiral Symmetry
• Shaving off soft hairs and the black hole image memory effect
• A 4D asymptotically flat rotating black hole solution including supertraslation correction