Journal of Algebraic Geometry

Author(s): Stefan Schröer
Journal: J. Algebraic Geom. 12 (2003), 699-714.
Posted: July 2, 2003
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Abstract: Replacing symmetric powers by divided powers and working over Witt vectors instead of ground fields, I generalize Kawamata's

-lifting theorem to characteristic

. Combined with the work of Deligne-Illusie on degeneration of the Hodge-de Rham spectral sequences, this gives unobstructedness for certain Calabi-Yau varieties with free crystalline cohomology modules.

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