Chiral Algebras of (0,2) Sigma Models: Beyond Perturbation Theory

TL;DR

This paper investigates the nonperturbative structure of chiral algebras in (0,2) sigma models, showing how instantons can trivialize the algebra and break supersymmetry, especially in the case of CP^1.

Contribution

It provides a detailed analysis of nonperturbative effects on chiral algebras in (0,2) models, highlighting the role of instantons in supersymmetry breaking beyond perturbation theory.

Findings

Instantons trivialize the chiral algebra in CP^1.

Supersymmetry is spontaneously broken due to nonperturbative effects.

A quantum deformation of the target space geometry affects the Dirac operators.

Abstract

We explore the nonperturbative aspects of the chiral algebras of N = (0,2) sigma models, which perturbatively are intimately related to the theory of chiral differential operators (CDOs). The grading by charge and scaling dimension is anomalous if the first Chern class of the target space is nonzero. This has some nontrivial consequences for the chiral algebra. As an example, we study the case where the target space is CP^1, and show that worldsheet instantons trivialize the chiral algebra entirely. Consequently, supersymmetry is spontaneously broken in this model. We then turn to a closer look at the supersymmetry breaking from the viewpoint of Morse theory on loop space. We find that instantons interpolate between pairs of perturbative supersymmetric states with different fermionic numbers, hence lifting them out of the supersymmetric spectrum. Our results reveal that a "quantum" deformation of the geometry of the target space leads to a trivialization of the kernels of certain twisted Dirac operators on CP^1.