Group action of Hochschild-Serre algebra and categorical reconstruction

Abstract

We study the action of the Serre functor of smooth proper dg categories at their Hochschild-Serre algebra, and the invariant sub-aglebra of the Serre functor. As applications, we prove some theorems of categorical Torelli. Namely, let $\Ku(\X)$ be the Kuznetsov component of degree $d$ smooth hypersurface in weighted projective space $\mathbb{P}(a_0,a_1,\cdots ,a_n)$, where the common maximal divisor $\gcd (d,{\sum }_{i=0}^n{a}_i)=1$. We show the categorical Torelli for $\Ku(\X)$. We show that the ${\mathbb{C}}^{\ast }$ equivariant matrix factorization category associated with a quasi-homogeneous polynomial function $f$ that has an isolated singularity together with a twisted functor $\{1\}$ reconstructs $f$ up to an isomorphism.

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