标题： 金属中的't Hooft反常 显示英文标题

标题： 't Hooft anomalies in metals

摘要： 我回顾了一些最近的结果，这些结果通过涌现对称性和't Hooft反常这些强大的场论概念，以精确的非微扰方式理解金属的物理性质。 't Hooft反常是一种离散的拓扑性质，具有全局对称性的量子场论可能具有这种性质。 我解释了金属的许多性质实际上可以看作是反常的直接结果。 这使得即使在强耦合动力学没有精确解的情况下，也能获得对金属（包括非费米液体）的结构性理解。 然后我概述了主要的局限性和待解决的问题。 显示英文摘要

摘要： I review some recent results on understanding the physics of metals in an exact non-perturbative way through the powerful field-theoretic concepts of emergent symmetries and 't Hooft anomalies. A 't Hooft anomaly is a discrete topological property that quantum field theories with global symmetries can have. I explain how many of the properties of metals can in fact be viewed as direct consequences of the anomaly. This allows a structural understanding of metals, including non-Fermi liquids, to be obtained even in the absence of any exact solution for the strongly coupled dynamics. I then outline the main limitations and outstanding questions.