arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1712.03211hep-th
收藏

BMS对称性、软粒子和记忆

BMS symmetry, soft particles and memory

Atreya Chatterjee, David A. Lowe

摘要:

在这项工作中,我们重新审视由麦卡锡发现的Bondi-Metzner-Sachs(BMS)群的酉不可约表示。除了四个动量外,表示还被标记为无限多个超动量。这些不可约表象的张量积导致了被软引力模装扮的类粒子态。在这种状态的散射中,4-动量和超动量的守恒导致编码在传出的软模式中的记忆效应。我们注意到,存在对应于软态的不可约表示,这些软态具有严格为零的四个动量,但它们可能是由类粒子态的散射产生的。这一事实对引力理论中的S矩阵有着有趣的意义。

英文摘要:

In this work, we revisit unitary irreducible representations of the Bondi-Metzner-Sachs (BMS) group discovered by McCarthy. Representations are labelled by an infinite number of super-momenta in addition to four-momentum. Tensor products of these irreducible representations lead to particle-like states dressed by soft gravitational modes. Conservation of 4-momentum and supermomentum in the scattering of such states leads to a memory effect encoded in the outgoing soft modes. We note there exist irreducible representations corresponding to soft states with strictly vanishing four-momentum, which may nevertheless be produced by scattering of particle-like states. This fact has interesting implications for the S-matrix in gravitational theories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑