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

Let MM be a rational homology sphere. For each Spin⁡c\operatorname{Spin}^c structure b∈Spin⁡c(M)b\in\operatorname{Spin}^c(M), suppose there are invariants Δb∈Q\Delta_b\in\mathbb{Q}, c∈Z≥0c\in\mathbb{Z}_{\ge 0}, and Z^b(q;M)∈2−cqΔbZ[[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 k∈Z>0k\in\mathbb{Z}_{>0}, the radial limits lim⁡q→ζkZ^b(q;M)\lim_{q\to\zeta_k}\widehat{Z}_b(q;M) converge and

Zk(M)=lim⁡q→ζk1(ζ2k−ζ2k−1)∣H1(M,Z)∣∑a,b∈Spin⁡c(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.

References

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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