https://haifei-home.pages.dev/tags/%E8%87%AA%E6%97%8B/Recent content in 自旋 on Haifei's HomeHugozh-CNhfwang132@gmail.com (hfwang132)hfwang132@gmail.com (hfwang132)This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.Wed, 09 Jul 2025 19:23:54 +0800https://haifei-home.pages.dev/post_20250709_%E8%87%AA%E6%97%8B%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AF%E7%9B%B8%E5%AF%B9%E8%AE%BA%E6%95%88%E5%BA%94/Wed, 09 Jul 2025 19:23:54 +0800hfwang132@gmail.com (hfwang132)https://haifei-home.pages.dev/post_20250709_%E8%87%AA%E6%97%8B%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AF%E7%9B%B8%E5%AF%B9%E8%AE%BA%E6%95%88%E5%BA%94/<p>结论：整数自旋是经典效应，而半整数自旋是量子效应，跟相对论关系不大。</p> <p>原因很简单：1-自旋是 SO(3) 的最小的忠实（faithful）表示，而 1/2-自旋是 SU(2) 的最小的忠实表示。</p>