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Let  X  be a compact Kähler space with klt singularities and vanishing first Chern class. We prove the Bochner principle for holomorphic tensors on the smooth locus of  X : any such tensor is parallel with respect to the singular Ricci-flat metrics. As a consequence, after a finite quasi-étale cover  X  splits off a complex torus of the maximum possible dimension. We then proceed to decompose the tangent sheaf of  X  according to its holonomy representation. In particular, we classify those  X  which have strongly stable tangent sheaf: up to quasi-étale covers, these are either irreducible Calabi–Yau or irreducible holomorphic symplectic. As an application of these results, we show that if  X  has dimension four, then it satisfies Campana’s Abelianity Conjecture.

Kähler spaces with zero first Chern class: Bochner principle, Albanese map and fundamental groups