Abstract
We consider \( \mathcal{N}=2 \) SU(2) gauge theories in four dimensions (pure or mass deformed) and discuss the properties of the simplest chiral observables in the presence of a generic Ω-deformation. We compute them by equivariant localization and analyze the structure of the exact instanton corrections to the classical chiral ring relations. We predict exact relations valid at all instanton number among the traces 〈Trφ n〉, where φ is the scalar field in the gauge multiplet. In the Nekrasov-Shatashvili limit, such relations may be explained in terms of the available quantized Seiberg-Witten curves. Instead, the full two-parameter deformation enjoys novel features and the ring relations require non trivial additional derivative terms with respect to the modular parameter. Higher rank groups are briefly discussed emphasizing non-factorization of correlators due to the Ω-deformation. Finally, the structure of the deformed ring relations in the \( \mathcal{N} = {2}^{\star } \) theory is analyzed from the point of view of the Alday-Gaiotto-Tachikawa correspondence proving consistency as well as some interesting universality properties.
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Beccaria, M., Fachechi, A. & Macorini, G. Chiral trace relations in Ω-deformed \( \mathcal{N}=2 \) theories. J. High Energ. Phys. 2017, 23 (2017). https://doi.org/10.1007/JHEP05(2017)023
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DOI: https://doi.org/10.1007/JHEP05(2017)023