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Essential dimension of representations of algebras
Commentarii Mathematici Helvetici ( IF 1.1 ) Pub Date : 2020-12-07 , DOI: 10.4171/cmh/500
Federico Scavia 1
Affiliation  

Let $k$ be a field, $A$ a finitely generated associative $k$-algebra and $\operatorname{Rep}_A[n]$ the functor $\operatorname{Fields}_k\to \operatorname{Sets}$, which sends a field $K$ containing $k$ to the set of isomorphism classes of representations of $A_K$ of dimension at most $n$. We study the asymptotic behavior of the essential dimension of this functor, i.e., the function $r_A(n) := \operatorname{ed}_k(\operatorname{Rep}_A[n])$, as $n\to\infty$. In particular, we show that the rate of growth of $r_A(n)$ determines the representation type of $A$. That is, $r_A(n)$ is bounded from above if $A$ is of finite representation type, grows linearly if $A$ is of tame representation type and grows quadratically if A is of wild representation type. Moreover, $r_A(n)$ is a finer invariant of A, which allows us to distinguish among algebras of the same representation type.

中文翻译:

代数表示的基本维数

设 $k$ 是一个域,$A$ 是有限生成的结合 $k$-代数和 $\operatorname{Rep}_A[n]$ 函子 $\operatorname{Fields}_k\to \operatorname{Sets}$,它将包含 $k$ 的字段 $K$ 发送到最多为 $n$ 维的 $A_K$ 表示的同构类集合。我们研究这个函子的本质维度的渐近行为,即函数 $r_A(n) := \operatorname{ed}_k(\operatorname{Rep}_A[n])$,如 $n\to\infty $. 特别是,我们表明 $r_A(n)$ 的增长率决定了 $A$ 的表示类型。也就是说,如果 $A$ 是有限表示类型,则 $r_A(n)$ 从上方有界,如果 $A$ 是驯服表示类型,则线性增长,如果 A 是野生表示类型,则增长二次。此外,$r_A(n)$ 是 A 的更精细的不变量,
更新日期:2020-12-07
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