https://scholars.lib.ntu.edu.tw/handle/123456789/634019
標題: | Gravitational Faraday effect from on-shell amplitudes | 作者: | Wei-Ming Chen Ming-Zhi Chung YU-TIN HUANG Jung-Wook Kim |
關鍵字: | Black Holes | Classical Theories of Gravity | Scattering Amplitudes; High Energy Physics - Theory; High Energy Physics - Theory; General Relativity and Quantum Cosmology | 公開日期: | 15-五月-2022 | 卷: | 2022 | 期: | 12 | 來源出版物: | J. High Energ. Phys. 2022, 58 (2022) | 摘要: | Effects of massive object's spin on massive-massless $2 \to 2$ classical scattering is studied. Focus is set on the less-considered dimensionless expansion parameter $\lambda/b$, where $\lambda$ is the massless particle's wavelength and $b$ is the impact parameter. Corrections in $\lambda/b$ start to appear from $\mathcal{O}(G^2)$, with leading correction terms tied to the gravitational Faraday effect, which is a special case of the Lense-Thirring effect. We compute the eikonal phase up to $\mathcal{O}(G^2)$ and extract spin effect on the scattering angle and time delay up to 14th order in spin. The gravitational Faraday effect at linear order in spin is reproduced by $\lambda/b$ correction terms, which we compute to higher orders in spin. We find that the equivalence principle, or universality, holds up to NLO for general spinning bodies, i.e. away from geometric optics limit. Furthermore, in the black hole limit, we confirm the absence of particular spin structure observed, along with the associated shift symmetry, and argue that it holds to arbitrary spin order at $\mathcal{O}(G^2)$ in the massless probe limit. |
描述: | published version; changed title; expanded discussions on the special role of Kerr coupling in exponentiation; additional references; 45 pages, 4 figures, 1 ancillary file |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/634019 | ISSN: | 1029-8479 | DOI: | 10.1007/JHEP12(2022)058 |
顯示於: | 物理學系 |
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