Polarizations and Hook Partitions

TL;DR

This paper explores the combinatorial and topological structures underlying polarizations of powers of the graded maximal ideal, linking Young tableaux, Schur modules, and discrete Morse theory to characterize these polarizations.

Contribution

It introduces a new combinatorial characterization of polarizations of restricted powers of the graded maximal ideal using Young tableaux and CW-complexes.

Findings

Established a CW-complex support for the L-complex of Buchsbaum and Eisenbud.

Translated spanning tree conditions into hook tableau conditions for Schur modules.

Provided a complete combinatorial characterization of polarizations of restricted powers.

Abstract

In this paper, we relate combinatorial conditions for polarizations of powers of the graded maximal ideal with rank conditions on submodules generated by collections of Young tableaux. We apply discrete Morse theory to the hypersimplex resolution introduced by Batzies--Welker to show that the $L$-complex of Buchsbaum and Eisenbud for powers of the graded maximal ideal is supported on a CW-complex. We then translate the "spanning tree condition" of Almousa--Fl\o ystad--Lohne characterizing polarizations of powers of the graded maximal ideal into a condition about which sets of hook tableaux span a certain Schur module. As an application, we give a complete combinatorial characterization of polarizations of so-called "restricted powers" of the graded maximal ideal.