تقرير
More on difference between angular momentum and pseudo-angular momentum
| العنوان: | More on difference between angular momentum and pseudo-angular momentum |
|---|---|
| المؤلفون: | Dai, Qi, Chen, Zi-Wei, Hua, Bang-Hui, Chen, Xiang-Song |
| سنة النشر: | 2023 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Classical Physics |
| الوصف: | 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 [Phys.Rev.B 103, L100409 (2021)] 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 $\int \text{d}^3 x\boldsymbol{E}$ and angular momentum $\int \text{d}^3 x (\boldsymbol{r}\times\boldsymbol{E})$ for a free electromagnetic wave, which are conserved quantities during propagation in vacuum. Comment: 8 pages, no figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2309.07130 |
| رقم الأكسشن: | edsarx.2309.07130 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |