Black hole shadow with soft hairs
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-09-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP09(2022)117 |
| _version_ | 1828238350347141120 |
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| author | Feng-Li Lin Avani Patel Hung-Yi Pu |
| author_facet | Feng-Li Lin Avani Patel Hung-Yi Pu |
| author_sort | Feng-Li Lin |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T21:02:17Z |
| format | Article |
| id | doaj.art-40e85ea25e6d4daebabaf5e583afb76c |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-12T21:02:17Z |
| publishDate | 2022-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-40e85ea25e6d4daebabaf5e583afb76c2022-12-22T03:16:48ZengSpringerOpenJournal of High Energy Physics1029-84792022-09-012022912910.1007/JHEP09(2022)117Black hole shadow with soft hairsFeng-Li Lin0Avani Patel1Hung-Yi Pu2Department of Physics, National Taiwan Normal UniversityDepartment of Physics, National Taiwan Normal UniversityDepartment of Physics, National Taiwan Normal UniversityAbstract 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.https://doi.org/10.1007/JHEP09(2022)117Black HolesClassical Theories of GravitySpace-Time Symmetries |
| spellingShingle | Feng-Li Lin Avani Patel Hung-Yi Pu Black hole shadow with soft hairs Journal of High Energy Physics Black Holes Classical Theories of Gravity Space-Time Symmetries |
| title | Black hole shadow with soft hairs |
| title_full | Black hole shadow with soft hairs |
| title_fullStr | Black hole shadow with soft hairs |
| title_full_unstemmed | Black hole shadow with soft hairs |
| title_short | Black hole shadow with soft hairs |
| title_sort | black hole shadow with soft hairs |
| topic | Black Holes Classical Theories of Gravity Space-Time Symmetries |
| url | https://doi.org/10.1007/JHEP09(2022)117 |
| work_keys_str_mv | AT fenglilin blackholeshadowwithsofthairs AT avanipatel blackholeshadowwithsofthairs AT hungyipu blackholeshadowwithsofthairs |