The twisted Fukaya-category conjecture for normal crossings surfaces

Let XX be a proper normal crossings surface with graph-like singular locus described by a trivalent graph G(X)G(X) and orientable dual intersection complex. For each edge ee whose component CeC_e of the singular locus is isomorphic to P1\mathbb{P}^1, set

ne=deg(Sing(X))Ce.n_e=-\deg(\mathfrak{Sing}(X))|_{C_e}.

Let ZZ be a Riemann surface with a pants decomposition whose graph is G(X)G(X), and let P({ne})P(\{n_e\}) be the graded symplectic manifold obtained by the stated cut-and-reglue construction. Twisted Fukaya-category conjecture. There is an equivalence

DSing(X)RFukgr(P({ne}),ΩZ).\operatorname{DSing}(X)\simeq \mathrm{RFuk}^{\mathrm{gr}}(P(\{n_e\}),\Omega_Z).

The right-hand category carries an autoequivalence Λ\Lambda and a natural isomorphism t:idΛ1[2]t:\mathrm{id}\to\Lambda^{-1}[2], giving a Λ\Lambda-twisted 22-periodic structure. This conjecturally extends the mirror description to nonzero degrees along the singular components.

Sources & referencesView supporting material

Primary source

James Pascaleff and Nicolò Sibilla, “Singularity categories of normal crossings surfaces, descent, and mirror symmetry”, arXiv:2208.03896 (2022).

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