# Chiral trace relations in $\Omega$-deformed $\mathcal N=2$ theories

## TL;DR

This paper studies chiral observables in four-dimensional $ ext{SU}(2)$ $ ext{N}=2$ gauge theories under $ ext{Omega}$-deformation, deriving exact instanton corrections and ring relations, with insights from localization, Seiberg-Witten theory, and AGT correspondence.

## Contribution

It provides explicit instanton-corrected relations among chiral traces in $ ext{Omega}$-deformed $ ext{N}=2$ theories, including the Nekrasov-Shatashvili limit and full two-parameter deformation, extending previous results.

## Key findings

- Derived exact relations among chiral traces valid at all instanton levels.
- Analyzed the structure of deformed ring relations, including derivative terms.
- Connected deformed ring relations to quantized Seiberg-Witten curves and AGT correspondence.

## 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 $\Omega$-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 $\langle\text{Tr}\varphi^{n}\rangle$, where $\varphi$ 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 $\Omega$-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.