Self-injective Jacobian algebras from Postnikov diagrams

TL;DR

This paper investigates algebras derived from Postnikov diagrams, showing they are self-injective under symmetry conditions and connecting them to Jacobian algebras with implications for 2-representation finiteness.

Contribution

It characterizes when these algebras are self-injective and links them to Jacobian algebras, introducing new 2-representation finite algebras through mutations.

Findings

Self-injective algebras correspond to symmetric Postnikov diagrams.

Identifies Jacobian algebra structure in self-injective cases.

Constructs new 2-representation finite algebras via mutations.

Abstract

We study a finite-dimensional algebra $\Lambda$ constructed from a Postnikov diagram $D$ in a disk, obtained from the dimer algebra of Baur-King-Marsh by factoring out the ideal generated by the boundary idempotent. Thus $\Lambda$ is isomorphic to the stable endomorphism algebra of the cluster tilting module $T\in\underline{\operatorname{CM}}(B)$ introduced by Jensen-King-Su in order to categorify the cluster algebra structure of $\mathbb C[\operatorname{Gr}_k(\mathbb C^n)]$. We show that $\Lambda$ is self-injective if and only if $D$ has a certain rotational symmetry. In this case, $\Lambda$ is the Jacobian algebra of a self-injective quiver with potential, which implies that its truncated Jacobian algebras in the sense of Herschend-Iyama are 2-representation finite. We study cuts and mutations of such quivers with potential leading to some new 2-representation finite algebras.