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arxiv: 1307.4793 · v2 · pith:432JFE5Mnew · submitted 2013-07-17 · ✦ hep-th · cond-mat.str-el

Topological Quantum Field Theory, Nonlocal Operators, and Gapped Phases of Gauge Theories

Sergei Gukov , Anton Kapustin This is my paper
classification ✦ hep-th cond-mat.str-el
keywords phasesoperatorssurfacecondensateconfinedgappedgaugeloop
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We revisit the role of loop and surface operators as order parameters for gapped phases of four-dimensional gauge theories. We show that in some cases surface operators are confined, and that this fact can be used to distinguish phases which are not distinguished by the Wilson-'t Hooft criterion. The long-distance behavior of loop and surface operators which are neither confined nor screened is controlled by a 4d TQFT. We construct these TQFTs for phases which are characterized by the presence of electrically and/or magnetically charged condensates. Interestingly, the TQFT describing a phase with a nonabelian monopole condensate is based on the theory of nonabelian gerbes. We also show that in phases with a dyonic condensate the low-energy theta-angle is quantized.

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