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arXiv 2003.07858math.RTmath.CTmath.RA
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形式DG代数的簇范畴与奇异范畴

Cluster categories of formal DG algebras and singularity categories

Norihiro Hanihara

摘要:

给定一个负分次Calabi-Yau代数,将其视为微分为零的DG代数,研究其簇范畴。我们证明了这个DG代数是符号扭曲的Calabi-Yau,并将其簇范畴实现为一个导出范畴的轨道范畴的三角壳,以及有限维Iwanaga-Gorenstein代数的奇异范畴.在此过程中,我们给出了两个独立的结果。首先,我们证明了Calabi-Yau代数上凝聚层的导出范畴有一个自然的簇倾斜子范畴,其维数由代数的Calabi-Yau维数和$a$ -不变量决定.其次,我们证明了由DG内函子及其同伦逆得到的两个DG轨道范畴是拟等价的。作为应用,我们证明了一个高表示无限代数的高簇范畴与一个明确描述的Iwanaga-Gorenstein代数的奇异范畴是三角等价的.此外,我们证明了我们的结果推广的背景下Keller-Murfet-Van den Bergh导出的轨道类别涉及的AR翻译的平方根。

英文摘要:

Given a negatively graded Calabi-Yau algebra, we regard it as a DG algebra with vanishing differentials and study its cluster category. We show that this DG algebra is sign-twisted Calabi-Yau, and realize its cluster category as a triangulated hull of an orbit category of a derived category, and as the singularity category of a finite dimensional Iwanaga-Gorenstein algebra. Along the way, we give two results which stand on their own. First, we show that the derived category of coherent sheaves over a Calabi-Yau algebra has a natural cluster tilting subcategory whose dimension is determined by the Calabi-Yau dimension and the $a$-invariant of the algebra. Secondly, we prove that two DG orbit categories obtained from a DG endofunctor and its homotopy inverse are quasi-equivalent. As an application, we show that the higher cluster category of a higher representation infinite algebra is triangle equivalent to the singularity category of an Iwanaga-Gorenstein algebra which is explicitly described. Also, we demonstrate that our results generalize the context of Keller--Murfet--Van den Bergh on the derived orbit category involving a square root of the AR translation.

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