Decomposition conjecture for compact Fujiki manifolds with vanishing first Chern class

Let XX be a compact Fujiki manifold such that c1(X)=0,H2(X,R)c_1(X)=0\\,\in\,H^2(X,\mathbb{R}). A finite étale cover of XX is a finite étale morphism XXX'\longrightarrow X. An irreducible Calabi–Yau manifold and an irreducible holomorphic symplectic manifold are the factors specified below; an ICY variety is a variety with trivial canonical class in the intended sense of the source, and terminal singularities are understood in the standard birational-geometric sense. The conjecture asserts that there is a finite étale cover XXX'\longrightarrow X and a decomposition

XT×iIYi×jJZj.X'\simeq T\times\prod_{i\in I}Y_i\times\prod_{j\in J}Z_j.

Here TT is a complex torus, each YiY_i is an irreducible Calabi–Yau manifold, and each ZjZ_j is an irreducible holomorphic symplectic manifold. Moreover, there are bimeromorphic maps YiY^iY_i\dashrightarrow\widehat Y_i and ZjZ^jZ_j\dashrightarrow\widehat Z_j, isomorphic in codimension one, such that each Y^i\widehat Y_i is a projective ICY variety with terminal singularities and each Z^j\widehat Z_j is a Kähler IHS variety with terminal singularities.

Decomposition Conjecture. Every compact Fujiki manifold with vanishing first Chern class admits such a finite étale cover and decomposition, together with the stated bimeromorphic models.

This proposes a Beauville–Bogomolov-type decomposition for compact Fujiki manifolds with vanishing first Chern class, extending the classical decomposition theorem beyond the Kähler setting. The parser supplies no resolution evidence, so the conjecture is recorded as open; the precise definitions of the Calabi–Yau, ICY, and IHS terminology should be checked against the paper.

Sources & referencesView supporting material

Primary source

Indranil Biswas, Junyan Cao, Sorin Dumitrescu and Henri Guenancia, “Geometry of K-trivial Moishezon manifolds : decomposition theorem and holomorphic geometric structures”, arXiv:2306.16729 (2024).

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