标题： 电磁场中的大扭量世界线 显示英文标题

标题： Massive twistor worldline in electromagnetic fields

摘要： 我们研究自旋粒子通过电磁场相互作用的(ambitwistor)模型，作为研究引力物体经典动力学的玩具模型，包括自旋的所有阶次效应。 我们计算了一循环阶次的动量冲击和自旋冲击，并精确展示了它们如何编码在经典eikonal中。 所有阶次自旋效应被编码为Newman-Janis位移的动力学实现，我们发现，在特定运动学配置下，自旋展开可以重新求和为简单的表达式，至少到一循环阶次。 我们确认经典eikonal可以理解为将散射过程的入态映射到出态的规范变换生成器。 我们还指出，将世界线传播子从时间对称转换为滞后形式的截断贡献相当于一循环阶次下主导eikonal的迭代作用。 显示英文摘要

摘要： We study the (ambi-)twistor model for spinning particles interacting via electromagnetic field, as a toy model for studying classical dynamics of gravitating bodies including effects of both spins to all orders. We compute the momentum kick and spin kick up to one-loop order and show precisely how they are encoded in the classical eikonal. The all-orders-in-spin effects are encoded as a dynamical implementation of the Newman-Janis shift, and we find that the expansion in both spins can be resummed to simple expressions in special kinematic configurations, at least up to one-loop order. We confirm that the classical eikonal can be understood as the generator of canonical transformations that map the in-states of a scattering process to the out-states. We also remark that cut contributions for converting worldline propagators from time-symmetric to retarded amount to the iterated action of the leading eikonal at one-loop order.