Influences of accretion flow and dilaton charge on the images of Einstein-Maxwell-dilation black hole
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866910822236684288 |
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| author | Chen, Gang Guo, Sen Li, Jia-Shuo Huang, Yu-Xiang Li, Li-Fang Xu, Peng |
| author_facet | Chen, Gang Guo, Sen Li, Jia-Shuo Huang, Yu-Xiang Li, Li-Fang Xu, Peng |
| contents | The characteristics and images of Einstein-Maxwell-Dilaton (EMD) black holes are examined in this paper, focusing on their effective potential, photon trajectories, and images with thin and thick accretion disks. We found that the shadow and photon sphere radii decrease with increasing dilaton charge. As the observation inclination increases, direct and secondary images become separate, with the direct image appearing hat-shaped. Simulations indicate that the brightness of the shadow and photon ring is higher in static spherical accretion flows compared to infalling ones. The study also shows that in thin disk accretion flows, the direct emission predominantly influences observed luminosity, with photon ring emission being less significant. Additionally, the appearance of black hole images varies with the observer's inclination angle. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_07618 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Influences of accretion flow and dilaton charge on the images of Einstein-Maxwell-dilation black hole Chen, Gang Guo, Sen Li, Jia-Shuo Huang, Yu-Xiang Li, Li-Fang Xu, Peng General Relativity and Quantum Cosmology The characteristics and images of Einstein-Maxwell-Dilaton (EMD) black holes are examined in this paper, focusing on their effective potential, photon trajectories, and images with thin and thick accretion disks. We found that the shadow and photon sphere radii decrease with increasing dilaton charge. As the observation inclination increases, direct and secondary images become separate, with the direct image appearing hat-shaped. Simulations indicate that the brightness of the shadow and photon ring is higher in static spherical accretion flows compared to infalling ones. The study also shows that in thin disk accretion flows, the direct emission predominantly influences observed luminosity, with photon ring emission being less significant. Additionally, the appearance of black hole images varies with the observer's inclination angle. |
| title | Influences of accretion flow and dilaton charge on the images of Einstein-Maxwell-dilation black hole |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2502.07618 |