The roots-of-unity MMR expansion conjecture for FKF_K

Let ω\omega be a primitive pp-th root of unity with p≥1p\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)=∑j≥0PK,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+x−1]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.

References

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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