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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2511.07488 |
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| _version_ | 1866914415684616192 |
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| author | Övgün, Ali |
| author_facet | Övgün, Ali |
| contents | We develop a quantum optical framework for probing black hole quasinormal modes (QNMs) using two-level atoms in the spirit of the horizon-brightened acceleration radiation (HBAR) program. Starting from the QNM contribution to the Wightman function of a scalar field on a static, spherically symmetric black hole background, we derive the response function of a two-level Unruh--DeWitt detector following simple trajectories (static at fixed radius, with comments on radial free fall). The QNM sector imprints a set of Lorentzian resonances in the detector spectrum at the redshifted real parts of the QNM frequencies, with widths determined by the imaginary parts. We then treat a single dominant QNM as an effective non-Hermitian cavity mode coupled to an ensemble of driven two-level atoms, and derive a master equation of Dicke laser type. The resulting lasing threshold condition depends explicitly on the QNM damping rate, providing a direct quantum optical interpretation of the imaginary part of the QNM frequency. Specializing to the Schwarzschild geometry, we express the resonant frequencies, linewidths, and threshold in terms of photon-sphere data in the eikonal limit. We discuss several extensions and propose our framework as a unifying language connecting black hole ringdown, near-horizon conformal quantum mechanics, and quantum optics, thereby enriching the emerging program of black hole spectroscopy in the gravitational-wave era. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_07488 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quasinormal Mode Spectroscopy via Horizon-Brightened Quantum Optics Övgün, Ali General Relativity and Quantum Cosmology High Energy Physics - Theory We develop a quantum optical framework for probing black hole quasinormal modes (QNMs) using two-level atoms in the spirit of the horizon-brightened acceleration radiation (HBAR) program. Starting from the QNM contribution to the Wightman function of a scalar field on a static, spherically symmetric black hole background, we derive the response function of a two-level Unruh--DeWitt detector following simple trajectories (static at fixed radius, with comments on radial free fall). The QNM sector imprints a set of Lorentzian resonances in the detector spectrum at the redshifted real parts of the QNM frequencies, with widths determined by the imaginary parts. We then treat a single dominant QNM as an effective non-Hermitian cavity mode coupled to an ensemble of driven two-level atoms, and derive a master equation of Dicke laser type. The resulting lasing threshold condition depends explicitly on the QNM damping rate, providing a direct quantum optical interpretation of the imaginary part of the QNM frequency. Specializing to the Schwarzschild geometry, we express the resonant frequencies, linewidths, and threshold in terms of photon-sphere data in the eikonal limit. We discuss several extensions and propose our framework as a unifying language connecting black hole ringdown, near-horizon conformal quantum mechanics, and quantum optics, thereby enriching the emerging program of black hole spectroscopy in the gravitational-wave era. |
| title | Quasinormal Mode Spectroscopy via Horizon-Brightened Quantum Optics |
| topic | General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2511.07488 |