Resurgence and radial-limit conjecture for Habiro elements of knots

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Let KK be a knot. Let FK(x)=ΦK(e−1/x)F_K(x)=\Phi_K(e^{-1/x}) be the formal expansion of the Habiro element ΦK\Phi_K around a root of unity, let GK(p)G_K(p) denote the Borel transform of FK(x)F_K(x), and let SKmed(x)S_K^{\mathrm{med}}(x) denote its median Borel sum. Write A=.BA\stackrel{.}{=}B when AA and BB agree up to a prefactor depending on KK. Resurgence and radial-limit conjecture. For every knot KK, (1) FK(x)F_K(x) has a resurgent Borel transform GK(p)G_K(p); (2) SKmed(x)S_K^{\mathrm{med}}(x) is analytic on Re⁡(x)>0\operatorname{Re}(x)>0 and has radial limits at the points 12πiQ\frac{1}{2\pi i}\mathbb{Q} of its natural boundary; and (3), if (2) holds, then for every 0≠α∈Q0\neq\alpha\in\mathbb{Q},

SKmed(−12πiα):=lim⁡x→−12πiαSKmed(x),Re⁡(x)>0,S_K^{\mathrm{med}}\left(-\frac{1}{2\pi i\alpha}\right):=\lim_{x\to-\frac{1}{2\pi i\alpha}}S_K^{\mathrm{med}}(x),\qquad \operatorname{Re}(x)>0,

satisfies

SKmed(−12πiα)=.ΦK(e2πiα).S_K^{\mathrm{med}}\left(-\frac{1}{2\pi i\alpha}\right)\stackrel{.}{=}\Phi_K(e^{2\pi i\alpha}).

This is the main conjecture attributed in the source to the cited work, within a broader program concerning analytic continuation of knot invariants arising from Chern–Simons theory. The supplied material gives no evidence that it has been resolved.

References

Primary source

Samuel Crew, Veronica Fantini, Ankush Goswami, Robert Osburn and Campbell Wheeler, “Resurgence, Habiro elements and strange identities”, arXiv:2304.07001 (2025).

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