Photon Spheres and shadow of modified black-hole entropies
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866909038915092480 |
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| author | Liu, Fang Ma, Yu-Bo Du, Yun-Zhi Li, Huai-Fan |
| author_facet | Liu, Fang Ma, Yu-Bo Du, Yun-Zhi Li, Huai-Fan |
| contents | Starting from the first law of black hole thermodynamics, we establish an explicit correspondence between the corrected entropy and the metric function under the condition of fixed black hole energy and horizon position. Using the corrected metric, we further compute the photon sphere radius and shadow size, demonstrating that different entropy corrections lead to characteristic optical shifts. By comparing with the Event Horizon Telescope observations of Sgr A*, we constrain the parameter range introduced in the corrected entropy. This provides a feasible approach for testing generalized entropy frameworks and probing deviations from the Bekenstein-Hawking area law. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_01303 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Photon Spheres and shadow of modified black-hole entropies Liu, Fang Ma, Yu-Bo Du, Yun-Zhi Li, Huai-Fan General Relativity and Quantum Cosmology 83C57, 83C75, 83D05 Starting from the first law of black hole thermodynamics, we establish an explicit correspondence between the corrected entropy and the metric function under the condition of fixed black hole energy and horizon position. Using the corrected metric, we further compute the photon sphere radius and shadow size, demonstrating that different entropy corrections lead to characteristic optical shifts. By comparing with the Event Horizon Telescope observations of Sgr A*, we constrain the parameter range introduced in the corrected entropy. This provides a feasible approach for testing generalized entropy frameworks and probing deviations from the Bekenstein-Hawking area law. |
| title | Photon Spheres and shadow of modified black-hole entropies |
| topic | General Relativity and Quantum Cosmology 83C57, 83C75, 83D05 |
| url | https://arxiv.org/abs/2605.01303 |