Balanced semisimple filtrations for tilting modules
Accepted version
Peer-reviewed
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Repository DOI
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
1088-4165
Volume Title
21
Publisher
American Mathematical Society