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arXiv 1002.3150math.NTmath.AC
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群表示的不可约准则及其在算术中的应用

An irreducibility criterion for group representations, with arithmetic applications

M. Longo, S. Vigni

摘要:

利用整数表示ρ在R的素理想上的约化,证明了整数表示ρ在诺特整环R的分数域上不可约的一个判别准则.作为应用,我们给出了剩余表示的普遍变形的不可约结果,特别注意与权至少为2的模形式相关的剩余伽罗瓦表示的普遍变形。

英文摘要:

We prove a criterion for the irreducibility of an integral group representation ρover the fraction field of a noetherian domain R in terms of suitably defined reductions of ρat prime ideals of R. As applications, we give irreducibility results for universal deformations of residual representations, with a special attention to universal deformations of residual Galois representations associated with modular forms of weight at least 2.

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