A Scaling Limit for Line and Surface Defects

Abstract

We study symmetry-breaking line defects in the Wilson-Fisher theory with $O(2N+1)$ global symmetry near four dimensions and symmetry-preserving surface defects in a cubic model with $O(2N)$ global symmetry near six dimensions. We introduce a scaling limit inspired by the large charge expansion in Conformal Field Theory. Using this, we compute the beta function for the defect coupling which allows to identify the corresponding Defect Conformal Field Theories. We also compute the correlation function of two parallel defects as well as correlation functions of certain defect operators with large charge under the surviving symmetry.

18 pages+appendices; 7 figures. Comments added

References in corpus (13)

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• Localized magnetic field in the $O(N)$ model
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• Spectral function of a localized fermion coupled to the Wilson-Fisher conformal field theory
• Monodromy Defects in Free Field Theories
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• More on the Weak Gravity Conjecture via Convexity of Charged Operators
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• Fusion of conformal defects in four dimensions
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Cited by in corpus (5)

• Localized magnetic field in the $O(N)$ model
• Phases of Wilson Lines in Conformal Field Theories
• RG flows on two-dimensional spherical defects
• Defects in scalar field theories, RG flows and Dimensional Disentangling
• Wilson loops in Large Symmetric Representations through a Double-Scaling Limit