Quasi-lisse extension of affine $\mathfrak{sl}_2$ \`{a} la Feigin--Tipunin

TL;DR

This paper studies a vertex algebra extension related to affine rak{sl}_2, demonstrating its quasi-lisse property, constructing modules, and establishing dualities and correspondences with quantum groups, thus advancing understanding in logarithmic conformal field theory.

Contribution

It introduces a quasi-lisse extension of the affine rak{sl}_2 algebra, constructs its modules, and establishes dualities with superalgebras and quantum groups, confirming conjectures in the field.

Findings

t_p(rak{sl}_2) is quasi-lisse with nilpotent cone as its associated variety.

Constructed infinitely many simple modules for t_p(rak{sl}_2).

Established the logarithmic Kazhdan--Lusztig correspondence for p=1.

Abstract

We study the affine analogue $\mathrm{FT}_p(\mathfrak{sl}_2)$ of the triplet algebra. We show that $\mathrm{FT}_p(\mathfrak{sl}_2)$ is quasi-lisse and the associated variety is the nilpotent cone of $\mathfrak{sl}_2$. We realize $\mathrm{FT}_p(\mathfrak{sl}_2)$ as the global sections of a sheaf of vertex algebras in the spirit of Feigin--Tipunin and thereby construct infinitely many simple modules and, in particular solve a conjecture by Semikhatov and Tipunin. We introduce the Kazama--Suzuki dual superalgebra $s\mathcal{W}_p(\mathfrak{sl}_{2|1})$ of $\mathrm{FT}_p(\mathfrak{sl}_2)$ and their singlet type subalgebras $s\mathcal{M}_p(\mathfrak{sl}_{2|1})$ and $\mathcal{M}_p(\mathfrak{sl}_2)$ and show their correspondence of categories. For $p=1$, we show the logarithmic Kazhdan--Lusztig correspondence for these (super)algebras and, in particular, show that the quantum group corresponding to $s\mathcal{M}_1(\mathfrak{sl}_{2|1})$ is the unrolled restricted quantum supergroup $u^H_{-1}(\mathfrak{sl}_{2|1})$ as suggested by Semikhatov and Tipunin.