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Balanced semisimple filtrations for tilting modules

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Hazi, A 

Abstract

Let $ U_l$ be a quantum group at an $ l$th root of unity, obtained via Lusztig's divided powers construction. Many indecomposable tilting modules for $ U_l$ have been shown to have what we call a balanced semisimple filtration, or a Loewy series whose semisimple layers are symmetric about some middle layer. The existence of such filtrations suggests a remarkably straightforward algorithm for calculating these characters if the irreducible characters are already known. We first show that the results of this algorithm agree with Soergel's character formula for the regular indecomposable tilting modules. We then show that these balanced semisimple filtrations really do exist for these tilting modules.

Description

Keywords

4904 Pure Mathematics, 49 Mathematical Sciences

Journal Title

Representation Theory

Conference Name

Journal ISSN

1088-4165
1088-4165

Volume Title

21

Publisher

American Mathematical Society