# Exact correlators on the Wilson loop in $$ \mathcal{N}=4 $$ SYM: localization, defect CFT, and integrability

## Author(s): Giombi, Simone; Komatsu, Shota

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Abstract: | <jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>We compute a set of correlation functions of operator insertions on the 1<jats:italic>/</jats:italic>8 BPS Wilson loop in <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathcal{N}=4 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>N</mml:mi> <mml:mo>=</mml:mo> <mml:mn>4</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> SYM by employing supersymmetric localization, OPE and the Gram-Schmidt orthogonalization. These correlators exhibit a simple determinant structure, are position-independent and form a topological subsector, but depend nontrivially on the ’t Hooft coupling and the rank of the gauge group. When applied to the 1<jats:italic>/</jats:italic>2 BPS circular (or straight) Wilson loop, our results provide an infinite family of exact defect CFT data, including the structure constants of protected defect primaries of arbitrary length inserted on the loop. At strong coupling, we show precise agreement with a direct calculation using perturbation theory around the AdS<jats:sub>2</jats:sub> string worldsheet. We also explain the connection of our results to the “generalized Bremsstrahlung functions” previously computed from integrability techniques, reproducing the known results in the planar limit as well as obtaining their finite <jats:italic>N</jats:italic> generalization. Furthermore, we show that the correlators at large <jats:italic>N</jats:italic> can be recast as simple integrals of products of polynomials (known as <jats:italic>Q</jats:italic>-functions) that appear in the Quantum Spectral Curve approach. This suggests an interesting interplay between localization, defect CFT and integrability.</jats:p> |

Publication Date: | 16-May-2018 |

Electronic Publication Date: | 16-May-2018 |

Citation: | Giombi, Simone, Komatsu, Shota. (2018). Exact correlators on the Wilson loop in $$ \mathcal{N}=4 $$ SYM: localization, defect CFT, and integrability. Journal of High Energy Physics, 2018 (5), 10.1007/jhep05(2018)109 |

DOI: | doi:10.1007/jhep05(2018)109 |

EISSN: | 1029-8479 |

Keywords: | AdS-CFT Correspondence, Conformal Field Theory, Supersymmetric Gauge Theory, Wilson, ’t Hooft and Polyakov loops |

Language: | en |

Type of Material: | Journal Article |

Journal/Proceeding Title: | Journal of High Energy Physics |

Version: | Final published version. This is an open access article. |

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