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On Knörrer Periodicity for Quadric Hypersurfaces in Skew Projective Spaces

Part of: Representation theory of rings and algebras Abelian categories Rings and algebras arising under various constructions Algebraic geometry: Foundations

Published online by Cambridge University Press:  03 December 2018

Kenta Ueyama
Kenta Ueyama*
Affiliation:
Department of Mathematics, Faculty of Education, Hirosaki University, 1 Bunkyocho, Hirosaki, Aomori 036-8560, Japan Email: [email protected]
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Abstract

We study the structure of the stable category $\text{}\underline{\mathsf{CM}}^{\mathbb{Z}}(S/(f))$ of graded maximal Cohen–Macaulay module over $S/(f)$ where $S$ is a graded ($\pm 1$)-skew polynomial algebra in $n$ variables of degree 1, and $f=x_{1}^{2}+\cdots +x_{n}^{2}$. If $S$ is commutative, then the structure of $\text{}\underline{\mathsf{CM}}^{\mathbb{Z}}(S/(f))$ is well known by Knörrer’s periodicity theorem. In this paper, we prove that if $n\leqslant 5$, then the structure of $\text{}\underline{\mathsf{CM}}^{\mathbb{Z}}(S/(f))$ is determined by the number of irreducible components of the point scheme of $S$ which are isomorphic to $\mathbb{P}^{1}$.

Keywords

Knörrer periodicitystable categorynoncommutative quadric hypersurfaceskew polynomial algebrapoint scheme

MSC classification

Primary: 16G50: Cohen-Macaulay modules
Secondary: 16S38: Rings arising from non-commutative algebraic geometry 18E30: Derived categories, triangulated categories 14A22: Noncommutative algebraic geometry
Type
Article
Information
Canadian Mathematical Bulletin , Volume 62 , Issue 4 , December 2019 , pp. 896 - 911
Copyright
© Canadian Mathematical Society 2018 

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Footnotes

The author was supported by JSPS Grant-in-Aid for Early-Career Scientists 18K13381.

References

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