Modularity and topological invariance conjecture for completed numerator series

Let RR be a plane curve germ over C\mathbb{C}, and let NZ^R(t)\widehat{\mathit{NZ}}_R(t) denote its completed numerator series. Modularity and topological invariance conjecture. There is a formal power series HR(t;q)Z[[q,t]]H_R(t;q)\in\mathbb{Z}[[q,t]] such that

NZ^R(t)=HR(t;L1);\widehat{\mathit{NZ}}_R(t)=H_R(t;\mathbb{L}^{-1});

for complex t,qt,q with q<1|q|<1, HR(t;q)H_R(t;q) converges; there is a rational number κ(R)\kappa(R) such that qκ(R)HR(1;q)q^{\kappa(R)}H_R(1;q) and qκ(R)HR(1;q)q^{\kappa(R)}H_R(-1;q) are Fourier expansions of weight-zero modular functions; and HR(t;q)H_R(t;q), or at least HR(±1;q)H_R(\pm1;q), is determined by the topology of the link associated to RR. The convergence assertion is attributed to earlier work for a special case, but the combined conjecture is presented as an open proposal.

Sources & referencesView supporting material

Primary source

Yifeng Huang and Ruofan Jiang, “Motivic Coh and Quot zeta functions of singular curves”, arXiv:2312.12528 (2025).

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