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- W3164667984 abstract "We study the supersymmetric partition function of a 2d linear $sigma$-model whose target space is a torus with a complex structure that varies along one worldsheet direction and a Kahler modulus that varies along the other. This setup is inspired by the dimensional reduction of a Janus configuration of 4d $mathcal{N}=4$ $U(1)$ Super-Yang-Mills theory compactified on a mapping torus ($T^2$ fibered over $S^1$) times a circle with an $SL(2,mathbb{Z})$ duality wall inserted on $S^1$, but our setup has minimal supersymmetry. The partition function depends on two independent elements of $SL(2,mathbb{Z})$, one describing the duality twist, and the other describing the geometry of the mapping torus. It is topological and can be written as a multivariate quadratic Gauss sum. By calculating the partition function in two different ways, we obtain identities relating different quadratic Gauss sums, generalizing the {it Landsberg-Schaar} relation. These identities are a subset of a collection of identities discovered by F. Deloup. Each identity contains a phase which is an eighth root of unity, and we show how it arises as a Berry phase in the supersymmetric Janus-like configuration. Supersymmetry requires the complex structure to vary along a semicircle in the upper half-plane, as shown by Gaiotto and Witten in a related context, and that semicircle plays an important role in reproducing the correct Berry phase." @default.
- W3164667984 created "2021-06-07" @default.
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- W3164667984 date "2021-05-25" @default.
- W3164667984 modified "2023-09-26" @default.
- W3164667984 title "Double-Janus linear sigma models and generalized reciprocity for Gauss sums" @default.
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- W3164667984 doi "https://doi.org/10.1007/jhep05(2021)227" @default.
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