海南师范大学学报（自然科学版）2024，Vol.37Issue(1)：14-19,6.DOI:10.12051/j.issn.1674-4942.2024.01.002
角动量和赝角动量的拓展讨论
More on Difference between Angular Momentum and Pseudo-angular Momentum
摘要
Abstract
We extend the discussion on the difference between angular momentum and pseudo-angular momentum in field theory.We show that the often quoted expressions in the paper of Streib only apply to a non-linear system,and derive the correct rotation symmetry and the corresponding angular momentum for a linear elastic system governed by Navier-Cauchy equation.By mapping the concepts and methods for the elastic wave into electromagnetic theory,we argue that the renowned canonical and Benlinfante angular momentum of light are actually pseudo-angular momentum.Then,we derive the"Newtonian"momentum ∫ d3xE and angular momentum ∫ d3 x(r × E)for a free electromagnetic wave,which are conserved quantities during propagation in vacuum.关键词
角动量/赝角动量/转动对称/弹性波/电磁波Key words
angular momentum/pseudo-angular momentum/rotation symmetry/elastic wave/electromagnetic wave分类
数理科学引用本文复制引用
戴琦,陈子维,华邦辉,陈相松..角动量和赝角动量的拓展讨论[J].海南师范大学学报（自然科学版）,2024,37(1):14-19,6.基金项目
国家自然科学基金项目(11535005) （11535005）
