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arXiv 0811.2620math.RTmath.AG
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几何Langlands对偶与约化群的形式

Geometric Langlands duality and forms of reductive groups

Vivek Dhand

摘要:

复约化群$G$的仿射格拉斯曼群上的反常层范畴给出了整数上Langlands对偶群$\check G_\bZ$的分裂形式的一个典范尺规作图法。给定一个域$k$,我们给出了$\check G_k$的拟分裂形式的Tannakian构造,以及与$\check G_k$的内部形式相联系的格的构造.

英文摘要:

The category of perverse sheaves on the affine Grassmannian of a complex reductive group $G$ gives a canonical geometric construction of the split form of the Langlands dual group $\check G_\bZ$ over the integers. Given a field $k$, we give a Tannakian construction of the quasi-split forms of $\check G_k$, as well as a construction of the gerbe associated to an inner form of $\check G_k$.

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