Universal deformation rings, endo-trivial modules, and semidihedral and generalized quaternion 2-groups

Universal deformation rings, endo-trivial modules, and semidihedral and generalized quaternion 2-groups
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通用变形环、内平凡模以及半二面体和广义四元数 2 组

DOI:
10.1016/j.jpaa.2018.08.006
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发表时间:
2019
影响因子:
0.8
通讯作者:
Soto, Roberto C.
Soto, Roberto C.
中科院分区:
数学2区
文献类型:
--
作者:
Bleher, Frauke M.;Chinburg, Ted;Soto, Roberto C.

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设k是特征为p>0的域,W是特征为0的完全离散赋值环,k是其剩余域。设G是一个有限群,Gab,p是它的极大交换p-商群。证明了内平凡Kg-模V有一个泛变形环,它与群环WGab,p同构.特别地,这肯定地回答了Bleher和Chinburg对所有内平凡模提出的一个问题.此外,我们还证明了V在WGab,p上的泛变形由V在W上的任何升力唯一地决定.当p=2且G是半面体或(广义)四元数的2-群时,我们给出了每个不可分解内平凡Kg-模V的泛变形的显式刻画.
Let k be a field of characteristic p> 0, and let W be a complete discrete valuation ring of characteristic 0 that has k as its residue field. Suppose G is a finite group and G ab, p is its maximal abelian p-quotient group. We prove that every endo-trivial kG-module V has a universal deformation ring that is isomorphic to the group ring W G ab, p. In particular, this gives a positive answer to a question raised by Bleher and Chinburg for all endo-trivial modules. Moreover, we show that the universal deformation of V over W G ab, p is uniquely determined by any lift of V over W. In the case when p= 2 and G is a 2-group that is either semidihedral or (generalized) quaternion, we give an explicit description of the universal deformation of every indecomposable endo-trivial kG-module V.
DOI: --
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期刊:
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