arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.11811math.RT
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多项式增长的广义Brauer树代数的模的泛变形环

Universal deformation rings of modules for generalized Brauer tree algebras of polynomial growth

David C. Meyer, Roberto C. Soto, Daniel J. Wackwitz

摘要:

设$k$是任意域,$Λ$是$k$ -代数,$V$是$Λ$ -模.当它存在时,$V$的泛变形环$R(Λ,V)$是一个$k$ -代数,它的局部同态将$V$的提升参数化到$R\otimes_k Λ$,其中$R$是任何完备的,局部可交换的带有剩余域$k$的Noether $k$ -代数.对称的特殊双曲代数与Brauer图代数是一致的,它可以看作是有限型$p$ -模群代数的块的推广. Bleher和Wackwitz对有限表示型对称特殊双曲代数的所有模进行了泛变形环的分类。在本文中,我们开始解决驯服的情况。具体地说,设$Λ$是任意1-国产的,对称的特殊双曲代数。通过将$Λ$看作广义Brauer树代数,并利用一个导出的等价关系,对具有稳定自同态环的$Λ$ -模$V$与$k$同构的泛变形环进行了分类.后者是一个自然条件,因为它保证了通用变形环$R(Λ,V)$的存在。

英文摘要:

Let $k$ be an arbitrary field, $Λ$ be a $k$-algebra and $V$ be a $Λ$-module. When it exists, the universal deformation ring $R(Λ,V)$ of $V$ is a $k$-algebra whose local homomorphisms to $R$ parametrize the lifts of $V$ up to $R\otimes_k Λ$, where $R$ is any complete, local commutative Noetherian $k$-algebra with residue field $k$. Symmetric special biserial algebras, which coincide with Brauer graph algebras, can be viewed as generalizing the blocks of finite type $p$-modular group algebras. Bleher and Wackwitz classified the universal deformation rings for all modules for symmetric special biserial algebras with finite representation type. In this paper, we begin to address the tame case. Specifically, let $Λ$ be any 1-domestic, symmetric special biserial algebra. By viewing $Λ$ as generalized Brauer tree algebras and making use of a derived equivalence, we classify the universal deformation rings for those $Λ$-modules $V$ with stable endomorphism ring isomorphic to $k$. The latter is a natural condition, since it guarantees the existence of the universal deformation ring $R(Λ,V)$.

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