Greybody factors, reflectionless scattering modes, and echoes of ultracompact horizonless objects
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866909038592131072 |
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| author | Rosato, Romeo Felice Biswas, Shauvik Chakraborty, Sumanta Pani, Paolo |
| author_facet | Rosato, Romeo Felice Biswas, Shauvik Chakraborty, Sumanta Pani, Paolo |
| contents | Motivated by a recently discovered connection between the greybody factors of black holes and the ringdown signal, we investigate the greybody factors of ultracompact horizonless objects, also elucidating their connection to echoes. The greybody factor of ultracompact objects features both low-frequency resonances and high-frequency, quasi-reflectionless scattering modes, which become purely reflectionless in the presence of symmetric cavity potentials, as it might be the case for a wormhole. We show that it is these high-frequency (quasi-)reflectionless scattering modes, rather than low-frequency resonances, to be directly responsible for the echoes in the time-domain response of ultracompact objects or of black holes surrounded by matter fields localized at large distances. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_16433 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Greybody factors, reflectionless scattering modes, and echoes of ultracompact horizonless objects Rosato, Romeo Felice Biswas, Shauvik Chakraborty, Sumanta Pani, Paolo General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Phenomenology Motivated by a recently discovered connection between the greybody factors of black holes and the ringdown signal, we investigate the greybody factors of ultracompact horizonless objects, also elucidating their connection to echoes. The greybody factor of ultracompact objects features both low-frequency resonances and high-frequency, quasi-reflectionless scattering modes, which become purely reflectionless in the presence of symmetric cavity potentials, as it might be the case for a wormhole. We show that it is these high-frequency (quasi-)reflectionless scattering modes, rather than low-frequency resonances, to be directly responsible for the echoes in the time-domain response of ultracompact objects or of black holes surrounded by matter fields localized at large distances. |
| title | Greybody factors, reflectionless scattering modes, and echoes of ultracompact horizonless objects |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.16433 |