The existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes
Abstract The existence of null circular geodesics in the background of non-extremal spherically symmetric asymptotically flat black holes has been proved in previous works. An interesting question that remains, however, is whether extremal black holes possess null circular geodesics outside horizons...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-04-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-023-11450-w |
| _version_ | 1827943239566491648 |
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| author | Yan Peng |
| author_facet | Yan Peng |
| author_sort | Yan Peng |
| collection | DOAJ |
| description | Abstract The existence of null circular geodesics in the background of non-extremal spherically symmetric asymptotically flat black holes has been proved in previous works. An interesting question that remains, however, is whether extremal black holes possess null circular geodesics outside horizons. In the present paper, we focus on the extremal spherically symmetric asymptotically flat hairy black holes. We show the existence of the fastest circular trajectory around an extremal black hole. As the fastest trajectory corresponds to the position of null circular geodesics, we prove that null circular geodesics exist outside extremal spherically symmetric asymptotically flat hairy black holes. |
| first_indexed | 2024-03-13T10:12:27Z |
| format | Article |
| id | doaj.art-4402f8e99c8b4e54a303bc27fc794f6b |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-03-13T10:12:27Z |
| publishDate | 2023-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-4402f8e99c8b4e54a303bc27fc794f6b2023-05-21T11:24:25ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522023-04-018341310.1140/epjc/s10052-023-11450-wThe existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holesYan Peng0School of Mathematical Sciences, Qufu Normal UniversityAbstract The existence of null circular geodesics in the background of non-extremal spherically symmetric asymptotically flat black holes has been proved in previous works. An interesting question that remains, however, is whether extremal black holes possess null circular geodesics outside horizons. In the present paper, we focus on the extremal spherically symmetric asymptotically flat hairy black holes. We show the existence of the fastest circular trajectory around an extremal black hole. As the fastest trajectory corresponds to the position of null circular geodesics, we prove that null circular geodesics exist outside extremal spherically symmetric asymptotically flat hairy black holes.https://doi.org/10.1140/epjc/s10052-023-11450-w |
| spellingShingle | Yan Peng The existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes European Physical Journal C: Particles and Fields |
| title | The existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes |
| title_full | The existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes |
| title_fullStr | The existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes |
| title_full_unstemmed | The existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes |
| title_short | The existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes |
| title_sort | existence of null circular geodesics outside extremal spherically symmetric asymptotically flat hairy black holes |
| url | https://doi.org/10.1140/epjc/s10052-023-11450-w |
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