Signatures in TQFT : Asymptotics and Modularity

Fuente: arXiv
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Autores principales: Marché, Julien, Masbaum, Gregor
Formato: Preprint
Publicado: 2025
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author Marché, Julien
Masbaum, Gregor
author_facet Marché, Julien
Masbaum, Gregor
contents We study the signature $σ_g(\frac q p)$ of $\mathrm{SU}_2$-TQFT vector spaces associated to surfaces of genus $g$, as a function of the defining root of unity $ζ=e^{iπq/p}$. We prove that $\frac{1}{p^2}σ_2(\frac{q}{p})$ converges to $Λ(θ)=\frac{16}{π^3}\sum\limits_{n\ge 1, \textrm{ odd}}\frac{1}{n^3\sin(nπθ)}$ when $\frac{q}{p}$ goes to an irrational number $θ\in [0,1]$ under certain conditions. We also observe that the function $Λ(θ)$ is the boundary value of an Eichler integral of a level $2$ modular form of weight $4$, and use this to propose a conjectural transformation law for the signature function in genus 2 similar to the reciprocity formula for classical Dedekind sums.
format Preprint
id arxiv_https___arxiv_org_abs_2512_13450
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Signatures in TQFT : Asymptotics and Modularity
Marché, Julien
Masbaum, Gregor
Geometric Topology
Number Theory
Quantum Algebra
57K16, 11F11, 11K50
We study the signature $σ_g(\frac q p)$ of $\mathrm{SU}_2$-TQFT vector spaces associated to surfaces of genus $g$, as a function of the defining root of unity $ζ=e^{iπq/p}$. We prove that $\frac{1}{p^2}σ_2(\frac{q}{p})$ converges to $Λ(θ)=\frac{16}{π^3}\sum\limits_{n\ge 1, \textrm{ odd}}\frac{1}{n^3\sin(nπθ)}$ when $\frac{q}{p}$ goes to an irrational number $θ\in [0,1]$ under certain conditions. We also observe that the function $Λ(θ)$ is the boundary value of an Eichler integral of a level $2$ modular form of weight $4$, and use this to propose a conjectural transformation law for the signature function in genus 2 similar to the reciprocity formula for classical Dedekind sums.
title Signatures in TQFT : Asymptotics and Modularity
topic Geometric Topology
Number Theory
Quantum Algebra
57K16, 11F11, 11K50
url https://arxiv.org/abs/2512.13450