Constructions of Non Commutative Instantons on $T^4$ and $K_3$

TL;DR

This paper extends the spectral-curve construction of instanton moduli spaces to noncommutative geometries on $T^4$ and $K_3$, revealing connections to supersymmetric gauge theories and Seiberg-Witten curves.

Contribution

It generalizes spectral-curve methods to noncommutative settings on $T^4$ and $K_3$, and links instanton moduli spaces to supersymmetric gauge theories and string compactifications.

Findings

Spectral curves are constructed inside twisted $T^4$ and $K_3$ without sections.

Moduli spaces of noncommutative instantons relate to Coulomb branches of 2+1D supersymmetric theories.

Extension of previous results for noncommutative instantons on $T^4$.

Abstract

We generalize the spectral-curve construction of moduli spaces of instantons on $\MT{4}$ and $K_3$ to noncommutative geometry. We argue that the spectral-curves should be constructed inside a twisted $\MT{4}$ or $K_3$ that is an elliptic fibration without a section. We demonstrate this explicitly for $T^4$ and to first order in the noncommutativity, for $K_3$. Physically, moduli spaces of noncommutative instantons appear as moduli spaces of theories with $\SUSY{4}$ supersymmetry in 2+1D. The spectral curves are related to Seiberg-Witten curves of theories with $\SUSY{2}$ in 3+1D. In particular, we argue that the moduli space of instantons of $U(q)$ Yang-Mills theories on a noncommutative $K_3$ is equivalent to the Coulomb branch of certain 2+1D theories with ${\cal N} = 4$ supersymmetry. The theories are obtained by compactifying the heterotic little-string theory on $T^3$ with global twists. This extends a previous result for noncommutative instantons on $\MT{4}$. We also briefly discuss the instanton equation on generic curved spaces.