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arXiv 1602.05196hep-thastro-ph.CO
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温伯格绝热模的温伯格软定理

Weinberg Soft Theorems from Weinberg Adiabatic Modes

Mehrdad Mirbabayi, Marko Simonović

摘要:

低能光子和引力子散射的软定理以及压缩极限关联函数的宇宙学相容性条件都被理解为在大规范变换下不变性的结果。我们应用相同的方法在宇宙学中使用的基础上识别的一组无限的“绝热模式”和相应的守恒电流-推导出平面空间的电动力学和引力的软定理。讨论了当软光子或引力子具有有限动量时,基于渐近对称群(BMS)的最新推导如何继续到围绕散射事件的有限尺寸球。我们给出了一个有限的距离推导的对映匹配条件之前施加的未来和过去的零无限大,并解释为什么所有的,但一个辐射自由度解耦的软限制。在BMS的早期作品相比,我们的工作与绝热模式对应的大规范变换是$r$依赖。

英文摘要:

Soft theorems for the scattering of low energy photons and gravitons and cosmological consistency conditions on the squeezed-limit correlation functions are both understood to be consequences of invariance under large gauge transformations. We apply the same method used in cosmology -- based on the identification of an infinite set of "adiabatic modes" and the corresponding conserved currents -- to derive flat space soft theorems for electrodynamics and gravity. We discuss how the recent derivations based on the asymptotic symmetry groups (BMS) can be continued to a finite size sphere surrounding the scattering event, when the soft photon or graviton has a finite momentum. We give a finite distance derivation of the antipodal matching condition previously imposed between future and past null infinities, and explain why all but one radiative degrees of freedom decouple in the soft limit. In contrast to earlier works on BMS, we work with adiabatic modes which correspond to large gauge transformations that are $r$-dependent.

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