English

Tilting theory for hypersurface singularities of dimension one

Representation Theory 2025-10-28 v2 Commutative Algebra Algebraic Geometry Rings and Algebras

Abstract

Any N\mathbb{N}-graded commutative Gorenstein ring RR of Krull dimension one with R0R_0 a field admits a standard silting object VV in the stable category CM0ZR\underline{\mathrm{CM}}_0^{\mathbb{Z}}R, and the object VV is tilting if and only if the aa-invariant aa is non-negative, as shown by Buchweitz, the first author, and Yamaura. In this article, under the additional assumption that RR is a hypersurface singularity, we prove that endomorphism algebra of VV is Iwanaga-Gorenstein of self-injective dimension at most 22, and we give its explicit presentation in terms of a quiver with relation. In the case of where aa is negative, we prove that the dg endomorphism algebra of VV 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 CM0ZR\mathrm{CM}_0^{\mathbb{Z}}R 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