Tilting Modules in Truncated Categories

Abstract

We begin the study of a tilting theory in certain truncated categories of modules $\mathcal G(Γ)$ for the current Lie algebra associated to a finite-dimensional complex simple Lie algebra, where $Γ= P^+ \times J$, $J$ 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 $\mathcal G(Γ')$ where $Γ' = P' \times J$, where $P'\subseteq P^+$ is saturated. Under certain natural conditions on $Γ'$, we note that $\mathcal G(Γ')$ admits full tilting modules.

v7: rearrangement of Sections 2, 3 and 7, reference [5] updated, misprints corrected