论文标题
以任意速度i：软辐射极限的Eikonal操作员
The eikonal operator at arbitrary velocities I: the soft-radiation limit
论文作者
论文摘要
到目前为止，已经发现与重力敌军的实际部分（例如偏转角和时间延迟）相关的可观察到的物品，其有效性从非权利主义者延伸到最极端的超级偏见（UR）策略，与无质量的粒子碰撞相连。为了描述引力辐射，必须将艾科纳尔阶段促进到一个统一的操作员，我们激励提案并开始在软辐射极限内讨论特性。发现收敛的PM扩展仅保持低于UR的结合（在GR文献中讨论）上面的趋势，而相反，需要进行不同的扩展，这通常意味着牛顿常数中某些非分析性。在这种极端的状态下，软辐射可观察物仅从重力群中获得贡献，因此是普遍的。这概括了\ cite {divecchia：2020ymx}以外的弹性情况的模式。
Observables related to the real part of the gravitational eikonal, such as the deflection angle and time delay, have been found so far to have a smooth post-Minkowskian (PM) expansion whose validity extends from the non-relativistic to the most extreme ultra-relativistic (UR) regime, which smoothly connects with massless particle collisions. To describe gravitational radiation, the eikonal phase has to be promoted to a unitary operator for which we motivate a proposal and start discussing properties in the soft-radiation limit. A convergent PM expansion is found to only hold below an UR bound (discussed in the GR literature in the seventies) above which a different expansion is instead needed implying, in general, some non-analyticity in Newton's constant. In this extreme UR regime soft radiative observables receive contributions only from gravitons and are therefore universal. This generalises the pattern discussed in \cite{DiVecchia:2020ymx} beyond the elastic case.
