Adapted Sequences and Polyhedral Realizations of Crystal Bases for highest weight modules
Abstract
The polyhedral realizations for crystal bases of the integrable highest weight modules of have been introduced in ([T.Nakashima, J. Algebra, vol.219, no. 2, (1999)]), which describe the crystal bases as sets of lattice points in the infinite -lattice given by some system of linear inequalities, where is a symmetrizable Kac-Moody Lie algebra. To construct the polyhedral realization, we need to fix an infinite sequence from the indices of the simple roots. If the pair (,) (: a dominant integral weight) satisfies the `ample' condition then there are some procedure to calculate the sets of linear inequalities. In this article, we show that if is an adapted sequence (defined in our paper [Y.Kanakubo, T.Nakashima, arXiv:1904.10919]) then the pair (, ) satisfies the ample condition for any dominant integral weight in the case is a classical Lie algebra. Furthermore, we reveal the explicit forms of the polyhedral realizations of the crystal bases associated with arbitrary adapted sequences in terms of column tableaux. As an application, we will give a combinatorial description of the function on the crystal base .
Keywords
Cite
@article{arxiv.2005.05966,
title = {Adapted Sequences and Polyhedral Realizations of Crystal Bases for highest weight modules},
author = {Yuki Kanakubo and Toshiki Nakashima},
journal= {arXiv preprint arXiv:2005.05966},
year = {2021}
}
Comments
38 pages. arXiv admin note: text overlap with arXiv:1904.10919