Squashed toric sigma models and mock modular forms

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 τ coming from the continuum produced by the neck. In the simplest case corresponding to squashed C/Z2 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. ar X iv :1 70 5. 00 64 9v 1 [ he pth ] 1 M ay 2 01 7