Hikami--GPPV--Manolescu radial limit conjecture for WRT invariants

Let MM be a rational homology sphere. For each Spinc\operatorname{Spin}^c structure bSpinc(M)b\in\operatorname{Spin}^c(M), suppose there are invariants ΔbQ\Delta_b\in\mathbb{Q}, cZ0c\in\mathbb{Z}_{\ge 0}, and Z^b(q;M)2cqΔbZ[[q]]\widehat{Z}_b(q;M)\in 2^{-c}q^{\Delta_b}\mathbb{Z}[[q]] that are conjugation-invariant and converge for q<1|q|<1. Let ζk=e(1/k)\zeta_k=\bm{e}(1/k) for positive integers kk. The radial limit conjecture. For infinitely many kZ>0k\in\mathbb{Z}_{>0}, the radial limits limqζkZ^b(q;M)\lim_{q\to\zeta_k}\widehat{Z}_b(q;M) converge and

Zk(M)=limqζk1(ζ2kζ2k1)H1(M,Z)a,bSpinc(M)e(klk(a,a)lk(a,b))Z^b(q;M),Z_k(M)=\lim_{q\to\zeta_k}\frac{1}{(\zeta_{2k}-\zeta_{2k}^{-1})\sqrt{|H_1(M,\mathbb{Z})|}}\sum_{a,b\in\operatorname{Spin}^c(M)}\bm{e}(k\operatorname{lk}(a,a)-\operatorname{lk}(a,b))\widehat{Z}_b(q;M),

where lk\operatorname{lk} is the linking form H1(M,Z)×H1(M,Z)ZH_1(M,\mathbb{Z})\times H_1(M,\mathbb{Z})\to\mathbb{Z}. This conjecture connects WRT invariants with radial limits of qq-series and has been proved by Murakami except for convergence of the individual radial limits.

Sources & referencesView supporting material

Primary source

Yuya Murakami, “A framework for proving quantum modularity: Application to Witten's asymptotic expansion conjecture”, arXiv:2508.21710 (2025).

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