The T^1-lifting theorem in positive characteristic
Abstract
Description
Replacing symmetric powers by divided powers and working over Witt vectors instead of ground fields, I generalize Kawamatas T^1-lifting theorem to characteristic p>0. 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.
13 pages, minor changes, to appear in J. Algebraic Geom
13 pages, minor changes, to appear in J. Algebraic Geom