Deformed matrix models, supersymmetric lattice twists and N=1/4 supersymmetry

TL;DR

This paper develops a supersymmetric matrix regularization for twisted N=(8,8) theories on curved backgrounds, introduces a deformed matrix model for N=4 SYM, and proposes a novel N=1/4 supersymmetry-preserving deformation of N=4 SYM on flat space.

Contribution

It constructs a nonperturbative matrix regularization preserving scalar supersymmetries and introduces a new N=1/4 supersymmetry-preserving deformation of N=4 SYM.

Findings

The regularization respects four exact scalar supersymmetries.

The deformed matrix model is equivalent to a non-commutative orbifold lattice.

The proposed N=1/4 deformation maintains supersymmetry in both regularized and continuum theories.

Abstract

A manifestly supersymmetric nonperturbative matrix regularization for a twisted version of N=(8,8) theory on a curved background (a two-sphere) is constructed. Both continuum and the matrix regularization respect four exact scalar supersymmetries under a twisted version of the supersymmetry algebra. We then discuss a succinct Q=1 deformed matrix model regularization of N=4 SYM in d=4, which is equivalent to a non-commutative $A_4^*$ orbifold lattice formulation. Motivated by recent progress in supersymmetric lattices, we also propose a N=1/4 supersymmetry preserving deformation of N=4 SYM theory on $\R^4$. In this class of N=1/4 theories, both the regularized and continuum theory respect the same set of (scalar) supersymmetry. By using the equivalence of the deformed matrix models with the lattice formulations, we give a very simple physical argument on why the exact lattice supersymmetry must be a subset of scalar subalgebra. This argument disagrees with the recent claims of the link approach, for which we give a new interpretation.