Quantum-symmetric equivalence for superpotential algebras

TL;DR

This paper introduces quantum-symmetric equivalence for superpotential algebras using Hopf coactions and bi-Galois objects, providing new insights into their Morita--Takeuchi equivalence and properties like regularity and Hilbert series.

Contribution

It defines quantum-symmetric equivalence relative to Hopf coactions, linking superpotential algebras via bi-Galois objects and cogroupoids, and characterizes algebraic properties through this framework.

Findings

Characterization of Artin--Schelter regularity via bi-Galois objects.

Application of pivotal structures to study quantum Hilbert series.

Establishment of Morita--Takeuchi equivalence between superpotential algebras.

Abstract

We study superpotential algebras by introducing the notion of quantum-symmetric equivalence defined relatively to two fixed Hopf coactions. This concept relies on the non-vanishing of a bi-Galois object for the two coacting Hopf algebras, where the cotensor product with this object provides a Morita--Takeuchi equivalence between their comodule categories, mapping one superpotenial algebra to the other as comodule algebras. In particular, we investigate $\mathcal{GL}$-type and $\mathcal{SL}$-type quantum-symmetric equivalences using Bichon's reformation of bi-Galois objects in the language of cogroupoids constructed by nondegenerate twisted superpotentials. As applications, for the $\mathcal{GL}$-type, we characterize the Artin--Schelter regularity, or equivalently, twisted Calabi--Yau property, of a superpotential algebra as the non-vanishing of the bi-Galois object in the associated cogroupoid. For the $\mathcal{SL}$-type, we apply the pivotal structure of the comodule categories to study numerical invariants for $\mathcal{SL}$ quantum-symmetric equivalence, including the quantum Hilbert series of the superpotential algebras.