Gauge theory in deformed N=(1,1) superspace

TL;DR

This paper reviews non-anticommutative Q-deformations of N=(1,1) supersymmetric theories in four-dimensional Euclidean harmonic superspace, highlighting their structure, symmetries, and quantum properties, including renormalizability and effective actions.

Contribution

It introduces the chiral singlet Q-deformation preserving key symmetries and details the superfield, component structures, and quantum aspects of the deformed gauge theories and hypermultiplets.

Findings

Deformed theories preserve chirality and harmonic analyticity.

The chiral singlet Q-deformation maintains SO(4) and SU(2) symmetries.

Proven renormalizability in the abelian case.

Abstract

We review the non-anticommutative Q-deformations of N=(1,1) supersymmetric theories in four-dimensional Euclidean harmonic superspace. These deformations preserve chirality and harmonic Grassmann analyticity. The associated field theories arise as a low-energy limit of string theory in specific backgrounds and generalize the Moyal-deformed supersymmetric field theories. A characteristic feature of the Q-deformed theories is the half-breaking of supersymmetry in the chiral sector of the Euclidean superspace. Our main focus is on the chiral singlet Q-deformation, which is distinguished by preserving the SO(4) Spin(4) ``Lorentz'' symmetry and the SU(2) R-symmetry. We present the superfield and component structures of the deformed N=(1,0) supersymmetric gauge theory as well as of hypermultiplets coupled to a gauge superfield: invariant actions, deformed transformation rules, and so on. We discuss quantum aspects of these models and prove their renormalizability in the abelian case. For the charged hypermultiplet in an abelian gauge superfield background we construct the deformed holomorphic effective action.