发表机构
Niels Bohr Institute; CENTRA, Departamento de Física, Instituto Superior Técnico – IST, Universidade de Lisboa – UL; CAMGSD, Departamento de Matemática, Instituto Superior Técnico – IST, Universidade de Lisboa – UL(尼尔斯·玻尔研究所; 里斯本大学高等理工学院物理中心; 里斯本大学高等理工学院数学应用与计算科学中心)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本研究通过黑洞微扰理论和波光学成像框架,首次从第一性原理模拟了绕Kerr黑洞轨道运动的振荡电偶极子的电磁辐射图像,揭示了相对论性聚束、引力透镜、爱因斯坦环及螺旋度相关的极化位移效应,为超越几何光学描述提供了基准。
AI 中文摘要
我们研究了绕Kerr黑洞轨道运动的振荡电偶极子的电磁辐射和波光学成像。我们推导了弯曲时空中点状振荡电偶极子相关的有效4-电流,并利用黑洞微扰理论,从第一性原理出发计算了由此在未来零无穷远处产生的辐射场。随后,我们为弯曲时空中运动的电磁源开发了一个波光学成像框架。我们获得了轨道运动电偶极子的图像,展示了相对论性聚束、引力透镜和爱因斯坦环。通过比较具有相反螺旋度的旋转偶极子产生的图像,我们研究了依赖于极化的散射,发现位移大致随辐射频率的倒数而减小,这符合超越几何光学效应的预期。我们的结果为Kerr时空中电磁辐射的超越几何光学描述提供了第一性原理基准。
英文摘要
We study the electromagnetic radiation and wave-optical imaging of an oscillating electric dipole orbiting a Kerr black hole. We derive the effective 4-current associated with a pointlike oscillating electric dipole in curved spacetime, and use black hole perturbation theory to compute the resulting radiation field at future null infinity, from first principles. We then develop a wave-optical imaging framework for a moving electromagnetic source in curved spacetime. We obtain images of an orbiting electric dipole, displaying relativistic beaming, gravitational lensing, and Einstein rings. We study polarization-dependent scattering by comparing the images produced by spinning dipoles with opposite helicities, finding a displacement that roughly decreases with the inverse of the radiation frequency, as expected for a beyond-geometric-optics effect. Our results provide a first-principles benchmark for beyond-geometric-optics descriptions of electromagnetic radiation in Kerr spacetime.
Comments18 pages, 13 figures