论文标题
软定理用于提升和其他时间对称性
Soft theorems for boosts and other time symmetries
论文作者
论文摘要
我们为理论得出了软定理，在这种理论中，时间对称性（涉及时间变化的对称性）是自发破坏的。柔软的定理涉及不等的时间相关函数，与远面的软金石插入。提供了几个示例的明确检查，包括相对论超流体的有效理论和通货膨胀的有效现场理论。我们讨论在某些情况下，这些不等的时间身份是如何在单独使用该领域相等相关因素的观察到的级别上捕获信息的。我们还讨论何时可以将这些软定理称为涉及相同相关因子的身份。
We derive soft theorems for theories in which time symmetries -- symmetries that involve the transformation of time, an example of which are Lorentz boosts -- are spontaneously broken. The soft theorems involve unequal-time correlation functions with the insertion of a soft Goldstone in the far past. Explicit checks are provided for several examples, including the effective theory of a relativistic superfluid and the effective field theory of inflation. We discuss how in certain cases these unequal-time identities capture information at the level of observables that cannot be seen purely in terms of equal-time correlators of the field alone. We also discuss when it is possible to phrase these soft theorems as identities involving equal-time correlators.
