On spin optics for gravitational waves lensed by a rotating object
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2023
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| _version_ | 1866929617057611776 |
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| author | Kubota, Kei-ichiro Arai, Shun Mukohyama, Shinji |
| author_facet | Kubota, Kei-ichiro Arai, Shun Mukohyama, Shinji |
| contents | We study gravitational lensing of gravitational waves taking into account the spin of a graviton coupled with a dragged spacetime made by a rotating object. We decompose the phase of gravitational waves into helicity-dependent and independent components with spin optics, analyzing waves whose wavelengths are shorter than the curvature radius of a lens object. We analytically confirm that the trajectory of gravitational waves splits depending on the helicity, generating additional time delay and elliptical polarization onto the helicity-independent part. We exemplify monotonic gravitational waves lensed by a Kerr black hole and derive the analytical expressions of corrections in phase and magnification. The corrections are enhanced for longer wavelengths, potentially providing a novel probe of rotational properties of lens objects in low-frequency gravitational-wave observations in the future. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_11024 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | On spin optics for gravitational waves lensed by a rotating object Kubota, Kei-ichiro Arai, Shun Mukohyama, Shinji General Relativity and Quantum Cosmology We study gravitational lensing of gravitational waves taking into account the spin of a graviton coupled with a dragged spacetime made by a rotating object. We decompose the phase of gravitational waves into helicity-dependent and independent components with spin optics, analyzing waves whose wavelengths are shorter than the curvature radius of a lens object. We analytically confirm that the trajectory of gravitational waves splits depending on the helicity, generating additional time delay and elliptical polarization onto the helicity-independent part. We exemplify monotonic gravitational waves lensed by a Kerr black hole and derive the analytical expressions of corrections in phase and magnification. The corrections are enhanced for longer wavelengths, potentially providing a novel probe of rotational properties of lens objects in low-frequency gravitational-wave observations in the future. |
| title | On spin optics for gravitational waves lensed by a rotating object |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2309.11024 |