Tilting Modules in Truncated Categories

TL;DR

This paper develops a tilting theory for certain truncated categories of modules over current Lie algebras, establishing the existence of full tilting modules under specific conditions.

Contribution

It introduces a new tilting theory in truncated module categories for current Lie algebras, extending to categories with saturated weight sets.

Findings

Established tilting theory in categories $ ext{G}( ext{Gamma})$ for current Lie algebras.

Proved existence of full tilting modules under natural conditions.

Extended tilting theory to categories with saturated weight sets.

Abstract

We begin the study of a tilting theory in certain truncated categories of modules $\mathcal G(\Gamma)$ for the current Lie algebra associated to a finite-dimensional complex simple Lie algebra, where $\Gamma = P^+ \times J$, $J$ is an interval in $\mathbb Z$, and $P^+$ is the set of dominant integral weights of the simple Lie algebra. We use this to put a tilting theory on the category $\mathcal G(\Gamma')$ where $\Gamma' = P' \times J$, where $P'\subseteq P^+$ is saturated. Under certain natural conditions on $\Gamma'$, we note that $\mathcal G(\Gamma')$ admits full tilting modules.