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arXiv 2202.08451math.RT
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有限群的模表示与李理论

Modular representations of finite groups and Lie theory

Raphael Rouquier

摘要:

本文从Broue的交换亏群猜想出发,讨论了Lie型有限群的模表示理论.我们讨论了定义特征的情况下,灵感Alperin的重量猜想,和非定义的情况下,灵感Broue的猜想。证明了一般有限群的模表示理论在定义特征和非定义特征上都与Lie型有限群的模表示理论相似.预期行为的模表示理论的有限群的李型定义的特点是特别难以把握沿线的Broue猜想,我们提出了一个新的问题有关的变化的中心字符。在非定义特征的Lie型有限群的模表示理论中引入了一种退化方法。结合反常等价的刚性属性,这为大特征提供了两个变量分解矩阵的设置。这应该有助于取得进展,寻找分解矩阵,一个突出的问题,除了一般线性群的情况下,很少有一般的结果。这最后一部分是基于与大卫·克雷文和奥利维尔·杜达斯的联合工作。

英文摘要:

This article discusses the modular representation theory of finite groups of Lie type from the viewpoint of Broue's abelian defect group conjecture. We discuss both the defining characteristic case, the inspiration for Alperin's weight conjecture, and the non-defining case, the inspiration for Broue's conjecture. The modular representation theory of general finite groups is conjectured to behave both like that of finite groups of Lie type in defining characteristic, and in non-defining characteristic, to a large extent. The expected behaviour of modular representation theory of finite groups of Lie type in defining characteristic is particularly difficult to grasp along the lines of Broue's conjecture and we raise a new question related to the change of central character. We introduce a degeneration method in the modular representation theory of finite groups of Lie type in non-defining characteristic. Combined with the rigidity property of perverse equivalences, this provides a setting for two variable decomposition matrices, for large characteristic. This should help make progress towards finding decomposition matrices, an outstanding problem with few general results beyond the case of general linear groups. This last part is based on joint work with David Craven and Olivier Dudas.

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