Exceptionally simple integrated correlators in N=4 supersymmetric Yang-Mills theory

Supersymmetric localisation has led to several modern developments in the study of integrated correlators in N = 4 supersymmetric Yang-Mills (SYM) theory. In particular, exact results have been derived for certain integrated four-point functions of superconformal primary operators in the stress tensor multiplet which are valid for all classical gauge groups, SU(N), SO(N), and USp(2N), and for all values of the complex coupling, tau = theta /(2 pi) + 4 pi i/g(YM)(2). In this work we extend this analysis and provide a unified two-dimensional lattice sum representation valid for all simple gauge groups, in particular for the exceptional series E-r (with r = 6, 7, 8), F-4 and G(2). These expressions are manifestly covariant under Goddard-Nuyts-Olive duality which for the cases of F-4 and G(2) is given by particular Fuchsian groups. We show that the perturbation expansion of these integrated correlators is universal in the sense that it can be written as a single function of three parameters, called Vogel parameters, and a suitable 't Hooft-like coupling. To obtain the perturbative expansion for the integrated correlator with a given gauge group we simply need substituting in this single universal expression specific values for the Vogel parameters. At the non-perturbative level we conjecture a formula for the one-instanton Nekrasov partition function valid for all simple gauge groups and for general ohm-deformation background. We check that our expression reduces in various limits to known results and that it produces, via supersymmetric localisation, the same one-instanton contribution to the integrated correlator as the one derived from the lattice sum representation. Finally, we consider the action of the hyperbolic Laplace operator with respect to tau-on the integrated correlators with exceptional gauge groups and derive inhomogeneous Laplace equations very similar to the ones previously obtained for classical gauge groups.

Automated summary

This work explores the application of supersymmetric localization in N = 4 supersymmetric Yang-Mills theory. By combining lattice sum representation with Goddard-Nuyts-Olive duality, a unified two-dimensional lattice sum representation applicable to all simple gauge groups is provided. Formulas are proposed for both perturbative and non-perturbative expansions for simple gauge groups and common backgrounds. In addition, new results regarding exceptional gauge groups are obtained by deriving Laplace equations for the integrated correlators.