Squashed Toric Sigma Models and Mock Modular Forms

R Gupta, Sameer Murthy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
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We study a class of two-dimensional (Formula presented.) sigma models called squashed toric sigma models, using their Gauged Linear Sigma Models (GLSM) description. These models are obtained by gauging the global (Formula presented.) 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 (Formula presented.) coming from the continuum produced by the neck. In the simplest case corresponding to squashed (Formula presented.) the elliptic genus is a mixed mock Jacobi form which coincides with the elliptic genus of the (Formula presented.)(Formula presented.) cigar coset.

Original languageEnglish
Pages (from-to)1-33
Number of pages33
JournalCommunications in Mathematical Physics
Early online date18 Jan 2018
Publication statusE-pub ahead of print - 18 Jan 2018


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