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arXiv 2011.08025math.AGmath.AC
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关于Pappas和Rapoport关于附于辛群的概型的一个猜想

Towards a conjecture of Pappas and Rapoport on a scheme attached to the symplectic group

Hanveen Koh

摘要:

设n = 2 r为偶数。本文考虑n阶斜对称矩阵概型的一个闭子概形V,它有辛群Sp(n)的自然作用.在特征不等于2的域F上,方案V同构于Pappas和Rapoport关于酉志村簇的局部模型的猜想中出现的方案。在附加的假设charF = 0或charF> r的条件下,证明了V的坐标环有一个基,该基由标以King的辛标准表的无奇数行的pf-n的乘积组成.当n是4的倍数时,可以利用基证明V的坐标环是整环,这证明了Pappas和Rapoport猜想的一个特例.

英文摘要:

Let n = 2r be an even integer. We consider a closed subscheme V of the scheme of n-by-n skew-symmetric matrices, on which there is a natural action of the symplectic group Sp(n). Over a field F of characteristic not equal to 2, the scheme V is isomorphic to the scheme appearing in a conjecture by Pappas and Rapoport on local models of unitary Shimura varieties. With the additional assumption char F = 0 or char F > r, we prove the coordinate ring of V has a basis consisting of products of pfaffians labelled by King's symplectic standard tableaux with no odd-sized rows. When n is a multiple of 4, the basis can be used to show that the coordinate ring of V is an integral domain, and this proves a special case of the conjecture by Pappas and Rapoport.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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