The Fukaya–Seidel and categorical intersection complex correspondence for hyperplane arrangements

Let X=(C)nCn+1X=(\mathbb{C}^*)^n\subset\mathbb{C}^{n+1}. A normal crossings divisor in Pn\mathbb{P}^n is the union of n+1n+1 hyperplanes in general position. The categorical intersection complex is the complex of categories obtained from the various intersections of these hyperplanes and their push-forward functors. An iterated Lefschetz fibration on XX determines a Fukaya–Seidel complex, denoted FS(π)\operatorname{FS}(\pi_{\bullet}). The Fukaya–Seidel and categorical intersection complex correspondence. There exists a family of iterated Lefschetz fibrations π\pi_{\bullet} on XX such that the corresponding Fukaya–Seidel complex FS(π)\operatorname{FS}(\pi_{\bullet}) is equivalent to the right adjoint of the categorical intersection complex of the normal crossings divisor given by n+1n+1 hyperplanes in Pn\mathbb{P}^n in general position. This generalizes the displayed comparison for three lines in P2\mathbb{P}^2; the source does not establish the asserted equivalence or provide evidence resolving the conjecture.

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Primary source

Merlin Christ, Tobias Dyckerhoff and Tashi Walde, “Complexes of stable -categories”, arXiv:2301.02606 (2024).

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