Advanced Studies in Pure Mathematics

Singular spaces with trivial canonical class

Daniel Greb, Stefan Kebekus, and Thomas Peternell

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The classical Beauville-Bogomolov Decomposition Theorem asserts that any compact Kähler manifold with numerically trivial canonical bundle admits an étale cover that decomposes into a product of a torus, and irreducible, simply-connected Calabi-Yau– and holomorphic-symplectic manifolds. The decomposition of the simply-connected part corresponds to a decomposition of the tangent bundle into a direct sum whose summands are integrable and stable with respect to any polarisation.

Building on recent extension theorems for differential forms on singular spaces, we prove an analogous decomposition theorem for the tangent sheaf of projective varieties with canonical singularities and numerically trivial canonical class.

In view of recent progress in minimal model theory, this result can be seen as a first step towards a structure theory of manifolds with Kodaira dimension zero. Based on our main result, we argue that the natural building blocks for any structure theory are two classes of canonical varieties, which generalise the notions of irreducible Calabi-Yau– and irreducible holomorphic-symplectic manifolds, respectively.

Article information

Minimal Models and Extremal Rays (Kyoto, 2011), J. Kollár, O. Fujino, S. Mukai and N. Nakayama, eds. (Tokyo: Mathematical Society of Japan, 2016), 67-113

Received: 12 December 2011
Revised: 29 July 2012
First available in Project Euclid: 4 October 2018

Permanent link to this document euclid.aspm/1538622705

Digital Object Identifier

Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 14J32: Calabi-Yau manifolds 14E30: Minimal model program (Mori theory, extremal rays) 32J27: Compact Kähler manifolds: generalizations, classification

Beauville-Bogomolov Decomposition Theorem Varieties of Kodaira Dimension Zero Calabi-Yau holomorphic-symplectic Varieties Minimal Model Theory


Greb, Daniel; Kebekus, Stefan; Peternell, Thomas. Singular spaces with trivial canonical class. Minimal Models and Extremal Rays (Kyoto, 2011), 67--113, Mathematical Society of Japan, Tokyo, Japan, 2016. doi:10.2969/aspm/07010067.

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