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  1. Article: The analytic structure of the fixed charge expansion.

    Antipin, Oleg / Bersini, Jahmall / Sannino, Francesco / Torres, Matías

    Journal of high energy physics : JHEP

    2022  Volume 2022, Issue 6, Page(s) 41

    Abstract: We investigate the analytic properties of the fixed charge expansion for a number of conformal field theories in different space-time dimensions. The models investigated here ... ...

    Abstract We investigate the analytic properties of the fixed charge expansion for a number of conformal field theories in different space-time dimensions. The models investigated here are
    Language English
    Publishing date 2022-06-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2027350-2
    ISSN 1029-8479 ; 1126-6708
    ISSN (online) 1029-8479
    ISSN 1126-6708
    DOI 10.1007/JHEP06(2022)041
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Gauge Invariance at Large Charge.

    Antipin, Oleg / Bednyakov, Alexander / Bersini, Jahmall / Panopoulos, Pantelis / Pikelner, Andrey

    Physical review letters

    2022  Volume 130, Issue 2, Page(s) 21602

    Abstract: Quantum field theories with global symmetries simplify considerably in the large-charge limit allowing us to compute correlators via a semiclassical expansion in the inverse powers of the conserved charges. A generalization of the approach to gauge ... ...

    Abstract Quantum field theories with global symmetries simplify considerably in the large-charge limit allowing us to compute correlators via a semiclassical expansion in the inverse powers of the conserved charges. A generalization of the approach to gauge symmetries has faced the problem of defining gauge-independent observables and, therefore, has not been developed so far. We employ the large-charge expansion to calculate the scaling dimension of the lowest-lying operators carrying U(1) charge Q in the critical Abelian Higgs model in D=4-ε dimensions to leading and next-to-leading orders in the charge and all orders in the ε expansion. Remarkably, the results match our independent diagrammatic computation of the three-loop scaling dimension of the operator ϕ^{Q}(x) in the Landau gauge. We argue that this matching is a consequence of the equivalence between the gauge-independent dressed two-point function of Dirac type with the gauge-dependent two-point function of ϕ^{Q}(x) in the Landau gauge. We, therefore, shed new light on the problem of defining gauge-independent exponents which has been controversial in the literature on critical superconductors, as well as lay the foundation for large-charge methods in gauge theories.
    Language English
    Publishing date 2022-04-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.021602
    Database MEDical Literature Analysis and Retrieval System OnLINE

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