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Bootstrapping line defects with $O(2)$ global symmetry

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arxiv 2208.11715 v2 pith:S55KJLU4 submitted 2022-08-24 hep-th cond-mat.str-el

classification hep-thcond-mat.str-el
keywords defectlinenumericalbootstrapdefectsglobalresultssymmetry
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We use the numerical bootstrap to study conformal line defects with $O(2)$ global symmetry. Our results are very general and capture in particular conformal line defects originating from bulk CFTs with a continuous global symmetry, which can either be preserved or partially broken by the presence of the defect. We begin with an agnostic approach and perform a systematic bootstrap study of correlation functions between two canonical operators on the defect: the displacement and the tilt. We then focus on two interesting theories: a monodromy line defect and a localized magnetic field line defect. To this end, we combine the numerical bootstrap with the $\varepsilon$-expansion, where we complement existing results in the literature with additional calculations. For the monodromy defect our numerical results are consistent with expectations, with known analytic solutions sitting inside our numerical bounds. For the localized magnetic field line defect our plots show a series of intriguing cusps which we explore.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Monodromy Pinning Defects in the Critical $\mathrm{O}(2N)$ Model

    hep-th 2025-10 conditional novelty 7.0 of 10

    A relevant spin-v perturbation of the O(2N) monodromy defect flows to a new 'monodromy pinning' spinning DCFT whose large-N operator dimensions and one-point functions are computed.

  2. The analytic bootstrap at finite temperature

    hep-th 2025-06 conditional novelty 7.0 of 10

    Universal dispersion-based formulae for thermal two-point functions of scalars that satisfy bootstrap axioms except clustering at infinite distance.

  3. Universal Constraints for Conformal Line Defects

    hep-th 2025-01 conditional novelty 7.0 of 10

    Any conformal line defect satisfies new integrated consistency conditions from shape deformation symmetry, verified against known data and used to predict new OPE coefficients.

  4. A relativistic continuous matrix product state study of field theories with defects

    hep-th 2025-01 conditional novelty 6.0 of 10

    Expectation values of local operators in phi^4 theory with a magnetic line defect are computed non-perturbatively using relativistic continuous matrix product states, by rotating Euclidean time so the defect becomes a...

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