AdS gravastar and bulk-cone singularities
Abstract The horizon of black hole is surrounded by the photon sphere and an outside observer cannot easily examine the geometry inside the photon sphere. In this note, we propose a way to investigate the region from dual conformal field theory by making use of AdS/CFT correspondence. We first const...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-07-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP07(2025)199 |
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| _version_ | 1849333880087117824 |
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| author | Heng-Yu Chen Yasuaki Hikida Yasutaka Koga |
| author_facet | Heng-Yu Chen Yasuaki Hikida Yasutaka Koga |
| author_sort | Heng-Yu Chen |
| collection | DOAJ |
| description | Abstract The horizon of black hole is surrounded by the photon sphere and an outside observer cannot easily examine the geometry inside the photon sphere. In this note, we propose a way to investigate the region from dual conformal field theory by making use of AdS/CFT correspondence. We first construct gravastar geometry as an asymptotic anti-de Sitter spacetime, where the region inside the photon sphere is replaced by a horizon-less geometry. It is known that bulk-cone singularities in the retarded Green function in dual conformal field theory can encode the bulk null geodesics. We then compute numerically the retarded Green function from the bulk theory and observe bulk-cone singularities corresponding to null geodesics traveling into the interior region. In this way, we show that it is possible to examine the region inside the photon sphere from bulk-cone singularities of dual conformal field theory. |
| format | Article |
| id | doaj-art-b5cdc5cea2e04d12b0e47bda9226f90d |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-b5cdc5cea2e04d12b0e47bda9226f90d2025-08-20T03:45:44ZengSpringerOpenJournal of High Energy Physics1029-84792025-07-012025713110.1007/JHEP07(2025)199AdS gravastar and bulk-cone singularitiesHeng-Yu Chen0Yasuaki Hikida1Yasutaka Koga2Department of Physics, National Taiwan UniversityFaculty of Information Science and Technology, Osaka Institute of TechnologyFaculty of Information Science and Technology, Osaka Institute of TechnologyAbstract The horizon of black hole is surrounded by the photon sphere and an outside observer cannot easily examine the geometry inside the photon sphere. In this note, we propose a way to investigate the region from dual conformal field theory by making use of AdS/CFT correspondence. We first construct gravastar geometry as an asymptotic anti-de Sitter spacetime, where the region inside the photon sphere is replaced by a horizon-less geometry. It is known that bulk-cone singularities in the retarded Green function in dual conformal field theory can encode the bulk null geodesics. We then compute numerically the retarded Green function from the bulk theory and observe bulk-cone singularities corresponding to null geodesics traveling into the interior region. In this way, we show that it is possible to examine the region inside the photon sphere from bulk-cone singularities of dual conformal field theory.https://doi.org/10.1007/JHEP07(2025)199AdS-CFT CorrespondenceBlack Holes |
| spellingShingle | Heng-Yu Chen Yasuaki Hikida Yasutaka Koga AdS gravastar and bulk-cone singularities Journal of High Energy Physics AdS-CFT Correspondence Black Holes |
| title | AdS gravastar and bulk-cone singularities |
| title_full | AdS gravastar and bulk-cone singularities |
| title_fullStr | AdS gravastar and bulk-cone singularities |
| title_full_unstemmed | AdS gravastar and bulk-cone singularities |
| title_short | AdS gravastar and bulk-cone singularities |
| title_sort | ads gravastar and bulk cone singularities |
| topic | AdS-CFT Correspondence Black Holes |
| url | https://doi.org/10.1007/JHEP07(2025)199 |
| work_keys_str_mv | AT hengyuchen adsgravastarandbulkconesingularities AT yasuakihikida adsgravastarandbulkconesingularities AT yasutakakoga adsgravastarandbulkconesingularities |