本书暂定概念:尚未进入正式概念库。下面是本书给出的定义原文。
定义 · 3.2 联络与曲率
这类不依赖于度规的作用量称为拓扑的(topological)。它们在经典物理中通常无关紧要。事实上,我们可以在局部写出 ,因此该作用量是一个全导数,不影响经典运动方程。尽管如此,拓扑作用量在量子物理中往往扮演微妙而有趣的角色。例如,作用量 正是拓扑绝缘体理论的基础。你可以在《规范理论》讲义的第 1 节中读到更多相关内容。
英文原文
Actions of this kind, which are independent of the metric, are called topological. They are typically unimportant in classical physics. Indeed, we can locally write , so the action is a total derivative and does not affect the classical equations of motion. Nonetheless, topological actions often play subtle and interesting roles in quantum physics. For example, the action underlies the theory of topological insulators. You can read more about this in Section 1 of the lectures on Gauge Theory.
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