Lattice-cohomology morphism conjecture for deformations of isolated curve singularities

Let {(Ct,o)}t(C,0)\{(C_t,o)\}_{t\in(\mathbb C,0)} be a flat deformation of isolated curve singularities. For each level nn, let \ell^* denote a vertex of the level set of the generic fibre and let lim\ell^*_{\lim} be its limiting lattice point on the special fibre. The map

lim\ell^*\mapsto \ell^*_{\lim}

from the 00-skeleton of the generic level set to the 00-skeleton of the special level set should lift to a map of the corresponding level sets

X~t0SnX~t=0Sn\widetilde X_{t\not=0}\cap S_n\to\widetilde X_{t=0}\cap S_n

that induces a degree-zero graded Z[U]\mathbb Z[U]-module morphism

Hq(Ct=0,o)Hq(Ct0,o)\mathbb H^q(C_{t=0},o)\to\mathbb H^q(C_{t\not=0},o)

for every q1q\geq1. Lattice-cohomology morphism conjecture. Such a lift and induced morphism exist for every flat deformation of isolated curve singularities. This is proposed as an enhancement of the paper's deformation theorem and would provide functorial maps on higher lattice cohomology under specialization; the source gives no resolution of the conjecture.

Sources & referencesView supporting material

Primary source

Tamás Ágoston and András Némethi, “Analytic lattice cohomology of isolated curve singularities”, arXiv:2301.08981 (2023).

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