On the Submodule Structure of Hook Specht Modules in Characteristic 2

TL;DR

This paper investigates the submodule structure of hook Specht modules in characteristic 2, providing a classification of which are uniserial, building on combinatorial descriptions for 2-part partitions.

Contribution

It offers a classification of uniserial hook Specht modules in characteristic 2, extending previous combinatorial results to a broader class of modules.

Findings

Classified uniserial hook Specht modules in characteristic 2

Utilized combinatorial descriptions of 2-part partitions

Connected submodule structures with filtrations of Specht modules

Abstract

The submodule structure of general Specht modules in prime characteristic is a difficult open problem. Kleshchev and Sheth [Journal of Algebra, 221(2), pp.705-722] gave a combinatorial description of the submodule structure of Specht modules labelled by $2$-part partitions in prime characteristic. Using this result, as well as filtrations of Specht modules labelled by hook partitions via $2$-part Specht modules in characteristic $2$, one can study the submodule structure of hook Specht modules. In particular, we classify which of these are uniserial.