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Singular spaces with trivial canonical class

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Daniel Greb
U Freiburg, z.Z. MI Bonn)
Don, 03/05/2012 - 10:30 - 12:00
MPIM Lecture Hall

The Beauville-Bogomolov decomposition theorem asserts that any compact Kähler manifold
with trivial canonical bundle is finitely covered by the product of a compact complex torus,
simply connected Calabi-Yau manifolds, and simply connected irreducible holomorphic
symplectic manifolds. The decomposition of the étale cover corresponds to a decomposition
of the tangent bundle into a direct sum, whose summands are integrable and stable with
respect to any polarization. Building on recent extension theorems for differential forms on
singular spaces, in the talk I will sketch the proof of an analogous decomposition theorem
for the tangent sheaf of a projective variety with canonical singularities and numerically
trivial canonical class. This is joint work with Stefan Kebekus and Thomas Peternell.

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