标题： 杨-Mills理论的渐近对称性 显示英文标题

标题： Asymptotic Symmetries of Yang-Mills Theory

摘要： 在闵可夫斯基空间中，对于具有无质量带电场的电磁理论，以及具有规范群G的非阿贝尔规范理论，在未来null无穷远（I+）处的渐近对称性在半经典水平上被考虑。 通过I+的电荷/颜色通量的可能性表明对称群是无限维的。 推测这些对称性包括一个G Kac-Moody对称性，其生成元是“大”规范变换，它们在I+处的共形二维球面上趋于局部全纯函数，并且在null平移下保持不变。 Kac-Moody电流是从I+未来边界处的规范场构造的。 电流Ward恒等式包括Weinberg的软光子定理及其颜色扩展。 显示英文摘要

摘要： Asymptotic symmetries at future null infinity (I+) of Minkowski space for electrodynamics with massless charged fields, as well as non-Abelian gauge theories with gauge group G, are considered at the semiclassical level. The possibility of charge/color flux through I+ suggests the symmetry group is infinite-dimensional. It is conjectured that the symmetries include a G Kac-Moody symmetry whose generators are "large" gauge transformations which approach locally holomorphic functions on the conformal two-sphere at I+ and are invariant under null translations. The Kac-Moody currents are constructed from the gauge field at the future boundary of I+. The current Ward identities include Weinberg's soft photon theorem and its colored extension.