Journal
PHYSICAL REVIEW D
Volume 103, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.125024
Keywords
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Funding
- Croatian Science Foundation [4418]
- European Union through the European Regional Development Fund-the Competitiveness and Cohesion Operational Programme [KK.01.1.1.06]
- Danish National Research Foundation [DNRF:90]
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This study introduces a new strategy to determine the anomalous dimensions of different operators in non-Abelian symmetry groups without the need for diagrammatic computations. By applying this computational strategy, the anomalous dimensions of several composite operators in the U(N) x U(M) model were successfully determined. The powerful combination of semiclassical methods and group theory allowed for the extraction of scaling dimensions for a wide range of operators for the first time.
We go beyond a systematic review of the semiclassical approaches for determining the scaling dimensions of fixed-charge operators in U(1) and O(N) models by introducing a general strategy apt at determining the relation between a given charge configuration and the associated operators for more involved symmetry groups such as the U(N) x U(M). We show how, varying the charge configuration, it is possible to access anomalous dimensions of different operators transforming according to a variety of irreducible representations of the non-Abelian symmetry group without the aid of diagrammatical computations. We illustrate our computational strategy by determining the anomalous dimensions of several composite operators to the next-to-leading order in the semiclassical expansion for the U(N) x U(M) conformal field theory (CFT) in 4 - epsilon dimensions. Thanks to the powerful interplay between semiclassical methods and group theory we can, for the first time, extract scaling dimensions for a wide range of operators.
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