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arXiv · 1906.10722

Higher depth quantum modular forms and plumbed $3$-manifolds

Kathrin Bringmann·Karl Mahlburg·Antun Milas
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Abstract

In this paper we study new invariants $\widehat{Z}_{\boldsymbol{a}}(q)$ attached to plumbed $3$-manifolds that were introduced by Gukov, Pei, Putrov, and Vafa. These remarkable $q$-series at radial limits conjecturally compute WRT invariants of the corresponding plumbed $3$-manifold. Here we investigate the series $\widehat{Z}_{0}(q)$ for unimodular plumbing ${\tt H}$-graphs with six vertices. We prove that for every positive definite unimodular plumbing matrix, $\widehat{Z}_{0}(q)$ is a depth two quantum modular form on $\mathbb{Q}$.

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Kathrin Bringmann, Karl Mahlburg, Antun Milas. 2019-06-25. Higher depth quantum modular forms and plumbed $3$-manifolds. https://doi.org/10.1007/s11005-020-01310-z

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