Virtual absorption modes of Schwarzschild-de Sitter spacetimes in semi-open systems
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866918406234570752 |
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| author | Wu, Liang-Bi Zhou, Yu-Sen Yu, Zhe Jia, Ming-Fei Cao, Li-Ming |
| author_facet | Wu, Liang-Bi Zhou, Yu-Sen Yu, Zhe Jia, Ming-Fei Cao, Li-Ming |
| contents | We present a study of virtual absorption modes (VAMs) in Schwarzschild-de Sitter (SdS) spacetime under semi-open boundary conditions, where the VAMs correspond to total transmission modes (TTMs) with the reflection amplitude being vanished. Our numerical analysis reveals that as the reflectivity $|\mathcal{K}|$ decreases, the VAM spectra migrate systematically toward regions of less negative imaginary parts, with each overtone exhibiting a critical reflectivity at which $\text{Im}(ω_{\text{VAM}})=0$. Using simulations based on spectral collocation methods, it is demonstrated that excitation precisely at a VAM spectrum leads to coherent perfect absorption (CPA). These results establish VAMs as the spectrum signatures of CPA for exotic compact objects (ECOs). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_22897 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Virtual absorption modes of Schwarzschild-de Sitter spacetimes in semi-open systems Wu, Liang-Bi Zhou, Yu-Sen Yu, Zhe Jia, Ming-Fei Cao, Li-Ming General Relativity and Quantum Cosmology We present a study of virtual absorption modes (VAMs) in Schwarzschild-de Sitter (SdS) spacetime under semi-open boundary conditions, where the VAMs correspond to total transmission modes (TTMs) with the reflection amplitude being vanished. Our numerical analysis reveals that as the reflectivity $|\mathcal{K}|$ decreases, the VAM spectra migrate systematically toward regions of less negative imaginary parts, with each overtone exhibiting a critical reflectivity at which $\text{Im}(ω_{\text{VAM}})=0$. Using simulations based on spectral collocation methods, it is demonstrated that excitation precisely at a VAM spectrum leads to coherent perfect absorption (CPA). These results establish VAMs as the spectrum signatures of CPA for exotic compact objects (ECOs). |
| title | Virtual absorption modes of Schwarzschild-de Sitter spacetimes in semi-open systems |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2603.22897 |