We have retold 1 papers by this author. 1 of them with a full read. most often about: squeezed state, topological insulator, electroweak_topological_susceptibility. 2 co-authors across our retellings.
In 1976, Gerard 't Hooft noticed that the vacuum of a gauge theory is not as simple as it seems: it possesses a topological structure that manifests itself in a nonzero topological susceptibility.
