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arXiv 0908.3868math.SGmath.AGmath.QA
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Poisson簇上的Poisson迹和D-模

Poisson traces and D-modules on Poisson varieties

Pavel Etingof, Travis Schedler, Ivan Losev

摘要:

对于特征为零的代数闭域上的每个Poisson代数簇X,我们正则地在X上附加一个右D-模M(X)。如果X是仿射的,则M(X)在X上的代数分布空间中的解是X上的泊松迹,即,Hamiltonian流下不变的分布。当X有n个辛叶时,我们证明了M(X)是完整的。因此,当X是仿射的,并且有2/4个辛叶时,X上的泊松迹空间是有限维的。作为应用,我们证明了非交换的滤过代数代数,如果其关联的分次代数代数是Poisson簇的坐标环,且该坐标环具有2/4个辛叶,则该代数具有2/4个不可约的有限维表示. Ivan Losev的附录加强了这一点,表明在这样的代数中,有许多素理想,并且它们都是本原的。更一般地,对于任意态射φ:X -> Y和X上Poisson模N的拟相干层,我们在X上附加了一个右D-模M_φ(X,N),并证明了它是完整的,如果X有n个辛叶,φ是有限的,N是相干的.作为一个应用,非交换滤过代数的不可约表示的有限性结果推广到了相关的分次代数不一定是交换的,而是作为其中心上的模生成的情形,该中心是一个Poisson簇的坐标环,该Poisson簇具有100个辛叶.我们还明确地描述(在仿射簇和紧凑的光滑流形的设置)的空间的泊松迹在X=V/G,其中V是辛和G是一个有限群忠实地作用于V。特别是,我们表明,这个空间是有限维的。

英文摘要:

To every Poisson algebraic variety X over an algebraically closed field of characteristic zero, we canonically attach a right D-module M(X) on X. If X is affine, solutions of M(X) in the space of algebraic distributions on X are Poisson traces on X, i.e., distributions invariant under Hamiltonian flows. When X has finitely many symplectic leaves, we prove that M(X) is holonomic. Thus, when X is affine and has finitely many symplectic leaves, the space of Poisson traces on X is finite-dimensional. As an application, we deduce that noncommutative filtered algebras whose associated graded algebras are coordinate rings of Poisson varieties with finitely many symplectic leaves have finitely many irreducible finite-dimensional representations. The appendix, by Ivan Losev, strengthens this to show that in such algebras, there are finitely many prime ideals, and they are all primitive. More generally, to any morphism phi: X -> Y and any quasicoherent sheaf of Poisson modules N on X, we attach a right D-module M_phi(X, N) on X, and prove that it is holonomic if X has finitely many symplectic leaves, phi is finite, and N is coherent. As an application, the finiteness result for irreducible representations of noncommutative filtered algebras extends to the case where the associated graded algebra is not necessarily commutative, but is finitely generated as a module over its center, which is the coordinate ring of a Poisson variety with finitely many symplectic leaves. We also describe explicitly (in the settings of affine varieties and compact smooth manifolds) the space of Poisson traces on X when X=V/G, where V is symplectic and G is a finite group acting faithfully on V. In particular, we show that this space is finite-dimensional.

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