Spin wave optics for gravitational waves lensed by a Kerr black hole
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913599364005888 |
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| author | Kubota, Kei-ichiro Arai, Shun Motohashi, Hayato Mukohyama, Shinji |
| author_facet | Kubota, Kei-ichiro Arai, Shun Motohashi, Hayato Mukohyama, Shinji |
| contents | Gravitational waves exhibit the unique signature of their spin-2 nature in processes of wave scattering, due to the interaction between spin and a background spacetime. Since the spin effect is more pronounced for longer wavelengths and gravitational waves sourced by binaries have a long wavelength, it may become an important effect in addition to the wave effect. We study the propagation of gravitational waves lensed by a Kerr black hole by numerically solving the Teukolsky equation with a source term of the equal-mass circular binary, taking into account both spin effect and wave effect. We find helicity-dependent small-period oscillation in the power spectrum of the amplification factor in the forward direction and the oscillation is enhanced as spin of a prograde Kerr black hole increases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_03289 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin wave optics for gravitational waves lensed by a Kerr black hole Kubota, Kei-ichiro Arai, Shun Motohashi, Hayato Mukohyama, Shinji General Relativity and Quantum Cosmology Gravitational waves exhibit the unique signature of their spin-2 nature in processes of wave scattering, due to the interaction between spin and a background spacetime. Since the spin effect is more pronounced for longer wavelengths and gravitational waves sourced by binaries have a long wavelength, it may become an important effect in addition to the wave effect. We study the propagation of gravitational waves lensed by a Kerr black hole by numerically solving the Teukolsky equation with a source term of the equal-mass circular binary, taking into account both spin effect and wave effect. We find helicity-dependent small-period oscillation in the power spectrum of the amplification factor in the forward direction and the oscillation is enhanced as spin of a prograde Kerr black hole increases. |
| title | Spin wave optics for gravitational waves lensed by a Kerr black hole |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2408.03289 |