Tilting theory for hypersurface singularities of dimension one
Abstract
Any -graded commutative Gorenstein ring of Krull dimension one with a field admits a standard silting object in the stable category , and the object is tilting if and only if the -invariant is non-negative, as shown by Buchweitz, the first author, and Yamaura. In this article, under the additional assumption that is a hypersurface singularity, we prove that endomorphism algebra of is Iwanaga-Gorenstein of self-injective dimension at most , and we give its explicit presentation in terms of a quiver with relation. In the case of where is negative, we prove that the dg endomorphism algebra of is Gorenstein, and we give its explicit presentation in terms of a dg path algebra. We explain our results by several examples including numerical semigroup algebras generated by two elements. Moreover, for each finite and countable Cohen-Macaulay representation type, we include the Auslander-Reiten quiver of the category with the position of the standard silting object. As a step of the proof of our results, we give a characterization of Gorensteinness of homologically finite dg algebras in terms of Serre functors.
Keywords
Cite
@article{arxiv.2508.12581,
title = {Tilting theory for hypersurface singularities of dimension one},
author = {Osamu Iyama and Junyang Liu},
journal= {arXiv preprint arXiv:2508.12581},
year = {2025}
}
Comments
31 pages; v2: included AR quivers for finite and countable CM types