English

Relation between two geometrically defined bases in representations of $GL_n$

Representation Theory 2007-05-23 v2 Algebraic Geometry

Abstract

Let VV be an irreducible representation of group GLn(C)GL_n({\mathbb C}), which appears as a submodule in (Cn)d({\mathbb C}^n)^{\otimes d}, where Cn{\mathbb C}^n is the tautological nn-dimensional representation of GLnGL_n, and dd is a non-negative integer. On the one hand, following refs [Gi] and [BG] one can produce a basis in VV using irreducible components of Sringer fibers over a nilpotent matrix in gld{\mathfrak {gl}}_d, whose Jordan blocks correspond to the highest weight of VV. On the other hand, one can produce a basis in VV by Mirkovi\'c-Vilonen cycles, a construction that works for an arbitrary reductive group GG. In this note we prove that the resulting to bases coincide.

Keywords

Cite

@article{arxiv.math/0411252,
  title  = {Relation between two geometrically defined bases in representations of $GL_n$},
  author = {Alexander Braverman and Dennis Gaitsgory and Maxim Vybornov},
  journal= {arXiv preprint arXiv:math/0411252},
  year   = {2007}
}