On extended Weil representation for finite general linear group and Howe correspondence
On extended Weil representation for finite general linear group and Howe correspondence
复制标题
有限一般线性群的扩展Weil表示和Howe对应
DOI:
10.1016/j.jalgebra.2020.04.024
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发表时间:
2020
影响因子:
0.9
通讯作者:
Takahiro Tsushima
中科院分区:
文献类型:
--
作者:
Shigeki Akiyama;Hajime Kaneko;Hiroyuki Nakaoka;Takahiro Tsushima
Let q be a power of a prime number. We construct a variety over a finite field F q and show that its middle cohomology realizes the Heisenberg–Weil representations of a general linear group G L n (q) for any integer n≥ 1. If n is even, by using an endomorphism of this variety, we can construct a representation of a semidirect group G L n (q)⋊(Z/2 Z), which is an extension of the Weil representation of G L n (q). By inflating this by a natural homomorphism S p n (q)× O 2+(q)→ G L n (q)⋊(Z/2 Z), we obtain a representation of S p n (q)× O 2+(q). This representation can be used for the Howe correspondence for (S p n, O 2+) in any characteristic. As application, we show that unipotency is preserved under the correspondence for (S p n, O 2+).
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DOI:
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