AI 中文总结
该研究探讨零边界处场论的渐近对称性，分析未被充分研究的整体零模式歧义，指出其可产生新的准局域边界可观测量并影响荷代数，且可出现在零无穷远和黑洞视界等各类零边界上。
AI 中文摘要
零边界处的渐近对称性为场论的软部分提供了有力研究窗口，可揭示超出标准体动力学的守恒荷与无穷维对称代数。这些结构通常与剩余规范变换相关，而零边界还存在特征性的整体零模式歧义，其物理后果尚未得到充分探究。我们探讨该零模式如何修正零边界处场论的正则结构，特别表明它会产生新的准局域边界可观测量，对荷代数有影响，且可出现在任意类型的零边界上，包括零无穷远和有限距离处（如黑洞视界）。
英文摘要
Asymptotic symmetries at null boundaries provide a powerful window into the soft sector of field theories, revealing conserved charges and infinite-dimensional symmetry algebras beyond the standard bulk dynamics. While these structures are usually associated with residual gauge transformations, null boundaries also exhibit a characteristic global zero-mode ambiguity, whose physical consequences are less explored. We discuss how this zero mode modifies the canonical structure of field theories at null boundaries. In particular, we show that it gives rise to a new quasilocal edge observable, with consequences to the charge algebra. It can arise on any kind of null boundaries, both at the null infinity and the finite distance such as a black hole horizon.
CommentsTo appear in Proceedings of Science for the Conference School "Foundations of General-Relativistic Gauge Field Theory" held at Politecnico di Torino, Italy, in March 2026
