The dynamical response of viscous objects to gravitational waves
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929604233527296 |
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| author | Boyanov, Valentin Cardoso, Vitor Kokkotas, Kostas D. Redondo-Yuste, Jaime |
| author_facet | Boyanov, Valentin Cardoso, Vitor Kokkotas, Kostas D. Redondo-Yuste, Jaime |
| contents | We study the dynamical response of viscous materials to gravitational waves, in the context of a fully relativistic theory of fluid dynamics. For the first time, we calculate oscillation modes and scattering properties of viscous stars. Viscous stars absorb high frequency radiation, following a dispersion relation introduced by Press. In the extremely large viscosity regime, stars would become reflectors of waves, but this regime appears to be forbidden by causality bounds. In the context of black hole mimickers, we show how maximally viscous stars on the threshold of stability mimic the absorption of a black hole with the same mass. Our results suggest that rotating viscous stars will amplify incoming radiation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_16861 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The dynamical response of viscous objects to gravitational waves Boyanov, Valentin Cardoso, Vitor Kokkotas, Kostas D. Redondo-Yuste, Jaime General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena We study the dynamical response of viscous materials to gravitational waves, in the context of a fully relativistic theory of fluid dynamics. For the first time, we calculate oscillation modes and scattering properties of viscous stars. Viscous stars absorb high frequency radiation, following a dispersion relation introduced by Press. In the extremely large viscosity regime, stars would become reflectors of waves, but this regime appears to be forbidden by causality bounds. In the context of black hole mimickers, we show how maximally viscous stars on the threshold of stability mimic the absorption of a black hole with the same mass. Our results suggest that rotating viscous stars will amplify incoming radiation. |
| title | The dynamical response of viscous objects to gravitational waves |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2411.16861 |