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Resurgent Lambert series with characters

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arxiv 2507.21352 v2 pith:JISRN5YE submitted 2025-07-28 math.NT hep-th

Resurgent Lambert series with characters

classification math.NT hep-th
keywords serieslambertcharactersresurgenttransseriestwistedeisensteinfricke
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We consider certain Lambert series as generating functions of divisor sums twisted by Dirichlet characters and compute their exact resurgent transseries expansion near $q=1^-$. For special values of the parameters, these Lambert series are expressible in terms of iterated integrals of holomorphic Eisenstein series twisted by the same characters and the transseries representation is a direct consequence of the action of Fricke involution on such twisted Eisenstein series. When the parameters of the Lambert series are generic the transseries representation provides for a quantum-modular version of Fricke involution which for a particular example we show being equivalent to modular resurgent structures found in topological strings observables.

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  1. Resurgent Lambert series from Feynman and beyond

    hep-th 2026-07 conditional novelty 6.0

    Sunrise/banana Feynman integrals and topological-string spectral traces are Lambert series twisted by Dirichlet characters; the P^{m,n} case with conductor N=m+n+1 splits into terminating even-character contributions ...