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Higher preprojective algebras, Koszul algebras, and superpotentials

Part of: Representation theory of rings and algebras Algebraic geometry: Foundations Abelian categories

Published online by Cambridge University Press:  01 February 2021

Joseph Grant  and
Osamu Iyama
Joseph Grant
Affiliation:
School of Mathematics, University of East Anglia, NorwichNR4 7TJ, [email protected]
Osamu Iyama
Affiliation:
Graduate School of Mathematics, Nagoya University, Chikusa-ku, Nagoya, [email protected], [email protected] Graduate School of Mathematical Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo153-8914, Japan
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Abstract

In this article we study higher preprojective algebras, showing that various known results for ordinary preprojective algebras generalize to the higher setting. We first show that the quiver of the higher preprojective algebra is obtained by adding arrows to the quiver of the original algebra, and these arrows can be read off from the last term of the bimodule resolution of the original algebra. In the Koszul case, we are able to obtain the new relations of the higher preprojective algebra by differentiating a superpotential and we show that when our original algebra is $d$-hereditary, all the relations come from the superpotential. We then construct projective resolutions of all simple modules for the higher preprojective algebra of a $d$-hereditary algebra. This allows us to recover various known homological properties of the higher preprojective algebras and to obtain a large class of almost Koszul dual pairs of algebras. We also show that when our original algebra is Koszul there is a natural map from the quadratic dual of the higher preprojective algebra to a graded trivial extension algebra.

Keywords

preprojective algebraJacobi algebrasuperpotentialCalabi–Yau algebraperiodic resolution

MSC classification

Primary: 16G70: Auslander-Reiten sequences (almost split sequences) and Auslander-Reiten quivers
Secondary: 18E30: Derived categories, triangulated categories 14A22: Noncommutative algebraic geometry 16G20: Representations of quivers and partially ordered sets
Type
Research Article
Information
Compositio Mathematica , Volume 156 , Issue 12 , December 2020 , pp. 2588 - 2627
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Copyright
© The Author(s) 2021

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Footnotes

J.G. was supported first by the Japan Society for the Promotion of Science and then by the Engineering and Physical Sciences Research Council [grant number EP/G007497/1]. O.I. was supported by JSPS Grant-in-Aid for Scientific Research (B) 24340004, (B) 16H03923, (C) 18K03209 and (S) 15H05738.

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