论文标题
重新访问Wess-Zumino的术语
Revisiting Wess-Zumino-Witten terms
论文作者
论文摘要
我们从现代的Bordism观点重新审视了有关$ su $和$ su $ su $ $ su $ $ su $ $ su $ $ su $ $ su $ su $ su $ su $ su $ su-zumino-witten(WZW)条款的各种拓扑问题。例如,我们解释了为什么$ 4D $ WZW项的定义需要旋转结构。我们还讨论了涉及$ $ $ QCD的1形对称性的混合异常如何在低能量Sigma模型中复制。
We revisit various topological issues concerning four-dimensional ungauged and gauged Wess-Zumino-Witten (WZW) terms for $SU$ and $SO$ quantum chromodynamics (QCD), from the modern bordism point of view. We explain, for example, why the definition of the $4d$ WZW terms requires the spin structure. We also discuss how the mixed anomaly involving the 1-form symmetry of $SO$ QCD is reproduced in the low-energy sigma model.