Asymptotic dynamics in perturbative quantum gravity and BMS supertranslations
Asymptotic dynamics in perturbative quantum gravity and BMS supertranslations
复制标题
微扰量子引力和 BMS 超平移中的渐近动力学
DOI：
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发表时间：
2017
影响因子：
5.4
通讯作者：
R. Akhoury
中科院分区：
文献类型：
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作者：
Sangmin Choi;Uri Kol;R. Akhoury
最近已经表明，在规范和引力理论的传统S-矩阵元素的红外发散产生的破坏与大规范对称性相关的守恒定律。用Faddeev-Kulish（FK）渐近态作为S-矩阵元的基础，可以消除这些红外发散。基于这种联系，我们研究了BMS超平移对微扰量子引力FK渐近态的作用。我们计算的BMS收费的FK状态，并表明，它的特点是超选择部门的国家属于。BMS电荷守恒则意味着在不同的超选择扇区之间没有跃迁，因此表明FK引力子云实现了由散射过程引起的必要跃迁。
Recently it has been shown that infrared divergences in the conventional S-matrix elements of gauge and gravitational theories arise from a violation of the conservation laws associated with large gauge symmetries. These infrared divergences can be cured by using the Faddeev-Kulish (FK) asymptotic states as the basis for S-matrix elements. Motivated by this connection, we study the action of BMS supertranslations on the FK asymptotic states of perturbative quantum gravity. We compute the BMS charge of the FK states and show that it characterizes the superselection sector to which the state belongs. Conservation of the BMS charge then implies that there is no transition between different superselection sectors, hence showing that the FK graviton clouds implement the necessary transition induced by the scattering process.