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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2604.18101 |
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| _version_ | 1866911607970332672 |
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| author | Liu, Wentao Wu, Di Fang, Xiongjun Liu, Yu-Xiao Wang, Jieci |
| author_facet | Liu, Wentao Wu, Di Fang, Xiongjun Liu, Yu-Xiao Wang, Jieci |
| contents | Optical reciprocity--the principle that light retraces the same path when source and detector are interchanged--is a foundational concept in geometric optics. In this Letter, we demonstrate that this ``symmetry-protected'' behavior can be qualitatively overturned in a rotating black hole when spontaneous Lorentz symmetry breaking introduces a nonminimally coupled background structure with a preferred direction. Through numerical ray-tracing simulations, we reveal a striking macroscopic signature: upon optical-path reversal achieved by exchanging the source and the observer, the shadow of the same black hole morphs from a quasi-symmetric rugby-ball shape into a distinct teardrop profile. This high-contrast nonreciprocity effectively turns the black hole into a cosmic-scale optical diode, offering a novel pathway to probe fundamental symmetries using current and next-generation horizon-scale imaging. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_18101 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Macroscopic Optical Nonreciprocity: A Black Hole as an Optical Diode Liu, Wentao Wu, Di Fang, Xiongjun Liu, Yu-Xiao Wang, Jieci General Relativity and Quantum Cosmology Optical reciprocity--the principle that light retraces the same path when source and detector are interchanged--is a foundational concept in geometric optics. In this Letter, we demonstrate that this ``symmetry-protected'' behavior can be qualitatively overturned in a rotating black hole when spontaneous Lorentz symmetry breaking introduces a nonminimally coupled background structure with a preferred direction. Through numerical ray-tracing simulations, we reveal a striking macroscopic signature: upon optical-path reversal achieved by exchanging the source and the observer, the shadow of the same black hole morphs from a quasi-symmetric rugby-ball shape into a distinct teardrop profile. This high-contrast nonreciprocity effectively turns the black hole into a cosmic-scale optical diode, offering a novel pathway to probe fundamental symmetries using current and next-generation horizon-scale imaging. |
| title | Macroscopic Optical Nonreciprocity: A Black Hole as an Optical Diode |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.18101 |