Solar energy paper index

Resurgent Lambert series from Feynman and beyond

2026-07-15 · arXiv: 2607.14020

One-line summary

A solar energy research paper on Resurgent Lambert series from Feynman and beyond.

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Chinese explanation / 中文解读

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Original abstract

Lambert series of the form $\sum_{n>0}a(n)q^n/(1-q^n)$ are ubiquitous in mathematical physics. In particular, 2-loop sunrise and 3-loop banana Feynman diagrams yield Lambert series with $a(n)$ of the form $χ(n)/n^s$ where $χ(n)$ is a Dirichlet character. Resurgence concerns the singular limit as $|q|$ approaches 1. In the Feynman cases we can control this limit, obtaining rapidly convergent expressions, since the Lambert series are iterated integrals of holomorphic Eisenstein series twisted by a character. We generalize this result, to include modular resurgent structures found in topological-string observables.

5.0Engineering value
7.0Research novelty
4.0Business relevance

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