Abstract
We consider the correlation functions of Coulomb branch operators in four-dimensional \( \mathcal{N} \) = 2 Superconformal Field Theories (SCFTs) involving exactly one antichiral operator. These extremal correlators are the “minimal” non-holomorphic local observables in the theory. We show that they can be expressed in terms of certain determinants of derivatives of the four-sphere partition function of an appropriate deformation of the SCFT. This relation between the extremal correlators and the deformed four-sphere partition function is non-trivial due to the presence of conformal anomalies, which lead to operator mixing on the sphere. Evaluating the deformed four-sphere partition function using supersymmetric localization, we compute the extremal correlators explicitly in many interesting examples. Additionally, the representation of the extremal correlators mentioned above leads to a system of integrable differential equations. We compare our exact results with previous perturbative computations and with the four-dimensional tt ∗ equations. We also use our results to study some of the asymptotic properties of the perturbative series expansions we obtain in \( \mathcal{N} \) = 2 SQCD.
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Gerchkovitz, E., Gomis, J., Ishtiaque, N. et al. Correlation functions of Coulomb branch operators. J. High Energ. Phys. 2017, 103 (2017). https://doi.org/10.1007/JHEP01(2017)103
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DOI: https://doi.org/10.1007/JHEP01(2017)103