A 2-categorical extension of Etingof-Kazhdan quantisation

TL;DR

This paper extends the Etingof-Kazhdan quantisation of Lie bialgebras to a 2-categorical setting, establishing functoriality of the associated Tannakian equivalence in a higher categorical framework.

Contribution

It introduces a 2-categorical extension of the Etingof-Kazhdan quantisation, proving the functoriality of the Tannakian equivalence in this new setting.

Findings

Established a 2-categorical framework for quantisation

Proved functoriality of the Tannakian equivalence in the extended setting

Enhanced understanding of quantum group structures in higher categories

Abstract

Let k be a field of characteristic zero. Etingof and Kazhdan constructed a quantisation U_h(b) of any Lie bialgebra b over k, which depends on the choice of an associator Phi. They prove moreover that this quantisation is functorial in b. Remarkably, the quantum group U_h(b) is endowed with a Tannakian equivalence F_b from the braided tensor category of Drinfeld-Yetter modules over b, with deformed associativity constraints given by Phi, to that of Drinfeld-Yetter modules over U_h(b). In this paper, we prove that the equivalence F_b is functorial in b.