Algebro-geometric Poincaré conjecture for dual complexes

Let (X,B)(X,B) be an nn-dimensional log Calabi–Yau pair, meaning that XX is a proper variety, BB is an effective R\mathbb{R}-divisor, (X,B)(X,B) is log canonical, and KX+BK_X+B is R\mathbb{R}-linearly trivial. Let D(X,B)\mathcal{D}(X,B) be its dual complex, let SkS^k be the kk-sphere, and let O(k)O(k) be the orthogonal group. Algebro-geometric Poincaré conjecture. There exist an integer kn1k\leq n-1 and a finite subgroup GO(k)G\leq O(k) such that

D(X,B)PLSk/G.\mathcal{D}(X,B)\simeq_{\rm PL} S^k/G.

This folklore conjecture was stated as a question by Kollár and Xu and is motivated by viewing dual complexes as combinatorial counterparts of spherical local models; no resolution is supplied here.

Sources & referencesView supporting material

Primary source

Mirko Mauri and Joaquín Moraga, “Birational complexity and dual complexes”, arXiv:2402.10136 (2024).

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