The roots-of-unity MMR expansion conjecture for FKF_K

Let ω\omega be a primitive pp-th root of unity with p1p\geq 1, let KK be a nice knot, and let FK(x,q)F_K(x,q) be its FKF_K series. Let PK,ω(j)(x)P_{K,\omega}^{(j)}(x) be the polynomials occurring in Habiro's roots-of-unity MMR expansion, and let ΔK(x)\Delta_K(x) be the Alexander polynomial. Roots-of-unity MMR conjecture for FKF_K. The series FKF_K has an expansion at q=ωq=\omega of the form

FK(x,h+ω)=j0PK,ω(j)(x)ΔK(xp)2j+1hj,F_K(x,h+\omega)=\sum_{j\geq 0}\frac{P_{K,\omega}^{(j)}(x)}{\Delta_K(x^p)^{2j+1}}h^j,

where PK,ω(j)(x)Z[ω][x+x1]P_{K,\omega}^{(j)}(x)\in\mathbb Z[\omega][x+x^{-1}] coincide with the polynomials in Habiro's conjecture. Both sides are understood as power series in xx and hh. The conjecture is presented as an expected analogue and remains open.

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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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