CHARACTER LEVELS AND CHARACTER BOUNDS

CHARACTER LEVELS AND CHARACTER BOUNDS
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角色等级和角色界限

DOI:
10.1017/fmp.2019.9
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发表时间:
2020
期刊:
Forum of mathematics
影响因子:
--
通讯作者:
Tiep, Pham Huu
Tiep, Pham Huu
中科院分区:
--
文献类型:
--
作者:
Guralnick, Robert;Larsen, Michael;Tiep, Pham Huu

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对有限群、一般群或特殊群、线性群和酉群的复不可约群,提出了字符水平的概念。我们根据一个字符的Lusztig标签和它的度给出它的层次特征。然后,我们证明了具有不太大中心化器的元素上的字符值的显式上界,并推导了与这些共轭类对应的随机游动的覆盖数和混合时间的上界。我们还用某些对偶对描述了字符的级别,并证明了字符值的显式指数字符边界,前提是级别不是太大。还提供了几个进一步的应用。其他有限经典群的相关结果在续文中得到[Guralnick et al. ' Character levels and Character bounds for finite classic groups ', Preprint, 2019, arXiv:1904.08070]。
We develop the concept of character level for the complex irreducible characters of finite, general or special, linear and unitary groups. We give characterizations of the level of a character in terms of its Lusztig label and in terms of its degree. Then we prove explicit upper bounds for character values at elements with not-too-large centralizers and derive upper bounds on the covering number and mixing time of random walks corresponding to these conjugacy classes. We also characterize the level of the character in terms of certain dual pairs and prove explicit exponential character bounds for the character values, provided that the level is not too large. Several further applications are also provided. Related results for other finite classical groups are obtained in the sequel [Guralnick et al. ‘Character levels and character bounds for finite classical groups’, Preprint, 2019, arXiv:1904.08070] by different methods.
Lusztig 归纳、单能支持和字符边界
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发表时间: 2020
影响因子: 1.3
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