轨道为Angular Momentum的引力波
Gravitational Waves with Orbital Angular Momentum
摘要：
像在GW150914中观测到的黑洞双星系统这样的紧凑轨道双星携带大量的轨道角动量。这种双星合并后形成的环缩后致密天体只有自旋角动量，这导致了大的轨道角动量过剩。一个重要的可能性是，系统产生的引力波带走了多余的轨道角动量。对这一超额进行了估计。在论证平面引力波不可能携带任何轨道角动量的基础上，本文提出了一种类似于光束的携带轨道角动量的引力波光束。限制到某些特定的梁配置，我们预测，这样的梁可能会产生一种新型的应变，除了在aLIGO测量的纵向应变GW150914和GW170817。因此，目前在引力波的平面波近似下推导出的对衰荡后自旋的限制有待改进。激光干涉仪检测器（如ALIGO或VIRGO）检测这些额外的菌株可能需要的最小修改也进行了简要讨论。
英文摘要：
Compact orbiting binaries like the black hole binary system observed in GW150914 carry large amount of orbital angular momentum. The post-ringdown compact object formed after merger of such a binary configuration has only spin angular momentum, and this results in a large orbital angular momentum excess. One significant possibility is that the gravitational waves generated by the system carry away this excess orbital angular momentum. An estimate of this excess is made. Arguing that plane gravitational waves cannot possibly carry any orbital angular momentum, a case is made in this paper for gravitational wave beams carrying orbital angular momentum, akin to optical beams. Restricting to certain specific beam-configurations, we predict that such beams may produce a new type of strain, in addition to the longitudinal strains measured at aLIGO for GW150914 and GW170817. Current constraints on post-ringdown spins, derived within the planewave approximation of gravitational waves, therefore stand to improve. The minimal modification that might be needed on a laser-interferometer detector (like aLIGO or VIRGO) to detect such additional strains is also briefly discussed.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
