Resurgence and radial-limit conjecture for Habiro elements of knots

Let KK be a knot. Let FK(x)=ΦK(e1/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 0αQ0\neq\alpha\in\mathbb{Q},

SKmed(12πiα):=limx12πiαSKmed(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.

Sources & referencesView supporting material

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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