Affordable Access

Affine PBW Bases and MV Polytopes in Rank 2

Authors
  • Muthiah, Dinakar
  • Tingley, Peter
Type
Preprint
Publication Date
Dec 16, 2012
Submission Date
Sep 10, 2012
Identifiers
arXiv ID: 1209.2205
Source
arXiv
License
Yellow
External links

Abstract

Mirkovic-Vilonen (MV) polytopes have proven to be a useful tool in understanding and unifying many constructions of crystals for finite-type Kac-Moody algebras. These polytopes arise naturally in many places, including the affine Grassmannian, pre-projective algebras, PBW bases, and KLR algebras. There has recently been progress in extending this theory to the affine Kac-Moody algebras. A definition of MV polytopes in symmetric affine cases has been proposed using pre-projective algebras. In the rank-2 affine cases, a combinatorial definition has also been proposed. Additionally, the theory of PBW bases has been extended to affine cases, and, at least in rank-2, we show that this can also be used to define MV polytopes. The main result of this paper is that these three notions of MV polytope all agree in the relevant rank-2 cases. Our main tool is a new characterization of rank-2 affine MV polytopes.

Report this publication

Statistics

Seen <100 times