A Remark on Random Vectors and Irreducible Representations

Abstract

The expectation of a squared scalar product of two random independent unit vectors that are uniformly distributed on a unit sphere in ${\mathbb{R}}^n$ is equal to $1/n$. We show that this is a characteristic property of random unit vectors defined on invariant probability subspaces of irreducible representations of compact Lie groups. We also discuss a relation of this fact to some properties of random invariant tensors