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arXiv 1106.4354math.RT
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有限群格式的广义支撑簇

Generalized support varieties for finite group schemes

Eric M. Friedlander, Julia Pevtsova

摘要:

我们构造了有限维模$M$的(投影化)支撑簇的两个加细族,用于有限群方案$G$。对于任意的有限群,我们将一族{ \it非极大秩簇} $Γ^j(G)_M$,$1\leq j \leq p-1$与一个$kG$ -模$M$相关联.对于$G$无穷小,对$\dim M$的任意分划$\ul a$,构造了$G$的单参数子群簇的局部闭子簇$V^{\ul a}(G)_M$.对于任意有限群概型$G$,常秩的$kG$ -模$M$和$\HHH^1(G,M)$中的上同调类$ζ$,我们引入了{ \it零轨迹} $Z(ζ) \subset Π(G)$ .证明了$Z(ζ)$是一个闭子簇,并将它与非极大秩簇联系起来。当$M$和$N$是常Jordan型$kG$ -模时,我们还将$Z(ζ)$的构造推广到任意扩张类$ζ\in \Ext^n_G(M,N)$.

英文摘要:

We construct two families of refinements of the (projectivized) support variety of a finite dimensional module $M$ for a finite group scheme $G$. For an arbitrary finite group scheme, we associate a family of {\it non maximal rank varieties} $Γ^j(G)_M$, $1\leq j \leq p-1$, to a $kG$-module $M$. For $G$ infinitesimal, we construct a finer family of locally closed subvarieties $V^{\ul a}(G)_M$ of the variety of one parameter subgroups of $G$ for any partition $\ul a$ of $\dim M$. For an arbitrary finite group scheme $G$, a $kG$-module $M$ of constant rank, and a cohomology class $ζ$ in $\HHH^1(G,M)$ we introduce the {\it zero locus} $Z(ζ) \subset Π(G)$. We show that $Z(ζ)$ is a closed subvariety, and relate it to the non-maximal rank varieties. We also extend the construction of $Z(ζ)$ to an arbitrary extension class $ζ\in \Ext^n_G(M,N)$ whenever $M$ and $N$ are $kG$-modules of constant Jordan type.

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