English

Serre algebra, matrix factorization and categorical Torelli theorem for hypersurfaces

Algebraic Geometry 2024-10-23 v2 Mathematical Physics math.MP

Abstract

Let XX be a smooth Fano variety. We attach a bi-graded associative algebra HS(Ku(X))=i,jZHom(Id,SKu(X)i[j])\mathrm{HS}(\mathcal{K}u(X))=\bigoplus_{i,j\in \mathbb{Z}} \mathrm{Hom}(\mathrm{Id},S_{\mathcal{K}u(X)}^{i}[j]) to the Kuznetsov component Ku(X)\mathcal{K}u(X) whenever it is defined. Then we construct a natural sub-algebra of HS(Ku(X))\mathrm{HS}(\mathcal{K}u(X)) when XX is a Fano hypersurface and establish its relation with Jacobian ring Jac(X)\mathrm{Jac}(X). As an application, we prove a categorical Torelli theorem for Fano hypersurface XPn(n2)X\subset\mathbb{P}^n(n\geq 2) of degree dd if gcd(n+1,d)=1.\mathrm{gcd}(n+1,d)=1. In addition, we give a new proof of the [Pir22,Theorem1.2][Pir22, Theorem 1.2] using a similar idea.

Keywords

Cite

@article{arxiv.2310.09927,
  title  = {Serre algebra, matrix factorization and categorical Torelli theorem for hypersurfaces},
  author = {Xun Lin and Shizhuo Zhang},
  journal= {arXiv preprint arXiv:2310.09927},
  year   = {2024}
}

Comments

13 pages, final version. To appear in Math Ann

R2 v1 2026-06-28T12:51:13.811Z