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arXiv 2006.07285math.RT
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$\mathbb{A}$型离散簇范畴的完备化

Completions of discrete cluster categories of type $\mathbb{A}$

Charles Paquette, Emine Yildirim

摘要:

我们完成了由Igusa和Todorov定义的$\mathbb{A}$型离散簇范畴,通过将这样一个离散簇范畴嵌入到一个更大的范畴中,然后取一定的Verdier商。所得到的范畴是一个包含离散簇范畴作为满子范畴的Hom-finite Krull-Schmidt三角范畴。这个新范畴中的对象和Hom-space可以用几何方法来描述,即使这个范畴不是$2$ -Calabi-Yau和Ext-space并不总是对称的。我们描述了所有的集群倾斜子类。给定这样一个子范畴,我们定义一个簇特征标,它在一个有无穷多个不定式的环中取值。我们的集群字符是新的,因为它考虑到无限维的子表示的无限维。我们证明了它满足乘法公式和交换公式,只要被交换的对象满足某些局部的Calabi-Yau条件。

英文摘要:

We complete the discrete cluster categories of type $\mathbb{A}$ as defined by Igusa and Todorov, by embedding such a discrete cluster category inside a larger one, and then taking a certain Verdier quotient. The resulting category is a Hom-finite Krull-Schmidt triangulated category containing the discrete cluster category as a full subcategory. The objects and Hom-spaces in this new category can be described geometrically, even though the category is not $2$-Calabi-Yau and Ext-spaces are not always symmetric. We describe all cluster-tilting subcategories. Given such a subcategory, we define a cluster character that takes values in a ring with infinitely many indeterminates. Our cluster character is new in that it takes into account infinite dimensional sub-representations of infinite dimensional ones. We show that it satisfies the multiplication formula and also the exchange formula, provided that the objects being exchanged satisfy some local Calabi-Yau conditions.

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