The Hopf-invariant formulas for fibered knots

Let KK be a knot, let \genusK\genusK denote its genus, let \hopfK\hopfK denote its Hopf invariant, let \el(K)\el(K) denote the integer-valued exponent invariant in the leading term of FKF_K, let ΔK(y)\Delta_K(y) denote its Alexander polynomial, and let \annK\an{n}{K} denote its Habiro coefficients. Hopf-invariant formulas conjecture. The formulas

\el(K)=\genusK\hopfK\el(K)=\genusK-\hopfK

and

\hopfK=\genusKi=02\genusK11i!iΔK3(y)yiy=0\an2\genusKiKqq=1\hopfK = \genusK-\sum_{i=0}^{2\genusK-1} \frac{1}{i!}\frac{\partial^i\Delta_K^3(y)}{\partial y^i}\biggr|_{y=0} \frac{\partial \an{2\genusK-i}{K}}{\partial q}\biggr|_{q=1}

hold for all fibered knots. These formulas relate the leading behavior of FKF_K to the Hopf invariant and to Habiro coefficients. The paper proves them for homogeneous braid knots and fibered knots of at most 12 crossings, leaving the assertion for all fibered knots open.

Sources & referencesView supporting material

Primary source

Paul Orland, Lara San Martín Suárez, Toby Saunders-A'Court and Josef Svoboda, “Quantum Invariants and Fiberedness”, arXiv:2512.23700 (2026).

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