Observational appearance of a freely-falling star in an asymmetric thin-shell wormhole
Abstract It has been recently reported that, at late times, the total luminosity of a star freely falling in black holes decays exponentially with time, and one or two series of flashes with decreasing intensity are seen by a specific observer, depending on the number of photon spheres. In this pape...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2023-05-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-023-11486-y |
| _version_ | 1797789655552229376 |
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| author | Yiqian Chen Peng Wang Houwen Wu Haitang Yang |
| author_facet | Yiqian Chen Peng Wang Houwen Wu Haitang Yang |
| author_sort | Yiqian Chen |
| collection | DOAJ |
| description | Abstract It has been recently reported that, at late times, the total luminosity of a star freely falling in black holes decays exponentially with time, and one or two series of flashes with decreasing intensity are seen by a specific observer, depending on the number of photon spheres. In this paper, we examine observational appearances of an infalling star in a reflection-asymmetric wormhole, which has two photon spheres, one on each side of the wormhole. We find that the late-time total luminosity measured by distant observers gradually decays with time or remains roughly constant due to the absence of the event horizon. Moreover, a specific observer would detect a couple of light flashes in a bright background at late times. These observations would offer a new tool to distinguish wormholes from black holes, even those with multiple photon spheres. |
| first_indexed | 2024-03-13T01:53:45Z |
| format | Article |
| id | doaj.art-b7c4c532ab754127a30d128dc45c5dfd |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-03-13T01:53:45Z |
| publishDate | 2023-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-b7c4c532ab754127a30d128dc45c5dfd2023-07-02T11:24:42ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522023-05-0183511410.1140/epjc/s10052-023-11486-yObservational appearance of a freely-falling star in an asymmetric thin-shell wormholeYiqian Chen0Peng Wang1Houwen Wu2Haitang Yang3Center for Theoretical Physics, College of Physics, Sichuan UniversityCenter for Theoretical Physics, College of Physics, Sichuan UniversityCenter for Theoretical Physics, College of Physics, Sichuan UniversityCenter for Theoretical Physics, College of Physics, Sichuan UniversityAbstract It has been recently reported that, at late times, the total luminosity of a star freely falling in black holes decays exponentially with time, and one or two series of flashes with decreasing intensity are seen by a specific observer, depending on the number of photon spheres. In this paper, we examine observational appearances of an infalling star in a reflection-asymmetric wormhole, which has two photon spheres, one on each side of the wormhole. We find that the late-time total luminosity measured by distant observers gradually decays with time or remains roughly constant due to the absence of the event horizon. Moreover, a specific observer would detect a couple of light flashes in a bright background at late times. These observations would offer a new tool to distinguish wormholes from black holes, even those with multiple photon spheres.https://doi.org/10.1140/epjc/s10052-023-11486-y |
| spellingShingle | Yiqian Chen Peng Wang Houwen Wu Haitang Yang Observational appearance of a freely-falling star in an asymmetric thin-shell wormhole European Physical Journal C: Particles and Fields |
| title | Observational appearance of a freely-falling star in an asymmetric thin-shell wormhole |
| title_full | Observational appearance of a freely-falling star in an asymmetric thin-shell wormhole |
| title_fullStr | Observational appearance of a freely-falling star in an asymmetric thin-shell wormhole |
| title_full_unstemmed | Observational appearance of a freely-falling star in an asymmetric thin-shell wormhole |
| title_short | Observational appearance of a freely-falling star in an asymmetric thin-shell wormhole |
| title_sort | observational appearance of a freely falling star in an asymmetric thin shell wormhole |
| url | https://doi.org/10.1140/epjc/s10052-023-11486-y |
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