# Squashed toric sigma models and mock modular forms

## TL;DR

This paper investigates squashed toric sigma models using GLSM techniques, computes their elliptic genera, and reveals their connection to mock modular forms, especially in cases related to Calabi-Yau geometries.

## Contribution

It introduces a new class of squashed toric sigma models, computes their elliptic genera, and links these to mock modular forms and non-holomorphic modular objects.

## Key findings

- Elliptic genus exhibits non-holomorphic dependence on modular parameter τ.
- In the case of squashed /_{2}, the elliptic genus is a mixed mock Jacobi form.
- The elliptic genus coincides with that of the N=(2,2) SL(2,R)/U(1) cigar coset.

## Abstract

We study a class of two-dimensional N=(2,2) sigma models called squashed toric sigma models, using their Gauged Linear Sigma Models (GLSM) description. These models are obtained by gauging the global U(1) symmetries of toric GLSMs and introducing a set of corresponding compensator superfields. The geometry of the resulting vacuum manifold is a deformation of the corresponding toric manifold in which the torus fibration maintains a constant size in the interior of the manifold, thus producing a neck-like region. We compute the elliptic genus of these models, using localization, in the case when the unsquashed vacuum manifolds obey the Calabi-Yau condition. The elliptic genera have a non-holomorphic dependence on the modular parameter $\tau$ coming from the continuum produced by the neck. In the simplest case corresponding to squashed $\mathbb{C}/\mathbb{Z}_{2}$ the elliptic genus is a mixed mock Jacobi form which coincides with the elliptic genus of the N=(2,2) SL(2,R)/U(1) cigar coset.