TAILIEUCHUNG - Đề tài " Localization of modules for a semisimple Lie algebra in prime characteristic "

We show that, on the level of derived categories, representations of the Lie algebra of a semisimple algebraic group over a field of finite characteristic with a given (generalized) regular central character are the same as coherent sheaves on the formal neighborhood of the corresponding (generalized) Springer fiber. | Annals of Mathematics Localization of modules for a semisimple Lie algebra in prime characteristic By Roman Bezrukavnikov Ivan Mirkovi c and Dmitriy Rumynin Annals of Mathematics 167 2008 945 991 Localization of modules for a semisimple Lie algebra in prime characteristic By Roman Bezrukavnikov Ivan Mirkovic and DMiTRiy RuMyNiN Abstract We show that on the level of derived categories representations of the Lie algebra of a semisimple algebraic group over a field of finite characteristic with a given generalized regular central character are the same as coherent sheaves on the formal neighborhood of the corresponding generalized Springer fiber. The first step is to observe that the derived functor of global sections provides an equivalence between the derived category of P-modules with no divided powers on the flag variety and the appropriate derived category of modules over the corresponding Lie algebra. Thus the derived version of the Beilinson-Bernstein localization theorem holds in sufficiently large positive characteristic. Next one finds that for any smooth variety this algebra of differential operators is an Azumaya algebra on the cotangent bundle. In the case of the flag variety it splits on Springer fibers and this allows us to pass from P-modules to coherent sheaves. The argument also generalizes to twisted P-modules. As an application we prove Lusztig s conjecture on the number of irreducible modules with a fixed central character. We also give a formula for behavior of dimension of a module under translation functors and reprove the Kac-Weisfeiler conjecture. The sequel to this paper BMR2 treats singular infinitesimal characters. To Boris Weisfeiler missing since 1985 Contents Introduction 1. Central reductions of the envelope PX of the tangent sheaf . Frobenius twist . The ring of crystalline differential operators Px . The difference I of pth power maps on vector fields . Central reductions . was partially supported by NSF grant .

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