English

Weights, Weyl-equivariant maps and a rank conjecture

Representation Theory 2019-04-16 v1

Abstract

In this note, given a pair (g,λ)(\mathfrak{g}, \lambda), where g\mathfrak{g} is a complex semisimple Lie algebra and λh\lambda \in \mathfrak{h}^* is a dominant integral weight of g\mathfrak{g}, where hg\mathfrak{h} \subset \mathfrak{g} is the real span of the coroots inside a fixed Cartan subalgebra, we associate an SU(2)SU(2) and Weyl equivariant smooth map f:X(Pm(C))nf: X \to (P^m(\mathbb{C}))^n, where XhR3X \subset \mathfrak{h} \otimes \mathbb{R}^3 is the configuration space of regular triples in h\mathfrak{h}, and mm, nn depend on the initial data (g,λ)(\mathfrak{g}, \lambda). We conjecture that, for any xX\mathbf{x} \in X, the rank of f(x)f(\mathbf{x}) is at least the rank of a collinear configuration in XX (collinear when viewed as an ordered rr-tuple of points in R3\mathbb{R}^3, with rr being the rank of g\mathfrak{g}). A stronger conjecture is also made using the singular values of a matrix representing f(x)f(\mathbf{x}). This work is a generalization of the Atiyah-Sutcliffe problem to a Lie-theoretic setting.

Keywords

Cite

@article{arxiv.1904.06426,
  title  = {Weights, Weyl-equivariant maps and a rank conjecture},
  author = {Joseph Malkoun},
  journal= {arXiv preprint arXiv:1904.06426},
  year   = {2019}
}

Comments

8 pages, 1 table of numerical values

R2 v1 2026-06-23T08:38:24.805Z