We propose a new probabilistic characterization of the uniform distribution on hyperspheres in terms of its inner product, extending the ideas of cuesta2009projection, cuesta2007sharp in a data-driven manner. Using this characterization, we define a new distance that quantifies the deviation of an arbitrary distribution from uniformity. As an application, we construct a novel nonparametric test for the uniformity testing problem: determining whether a set of \ (n\) i. i. d. random points on the \ (p\) -dimensional hypersphere is approximately uniformly distributed. The proposed test is based on a degenerate U-process and is universally consistent in fixed-dimensional settings. Furthermore, in high-dimensional settings, it stands apart from existing tests with its simple implementation and asymptotic theory, while also possessing a model-free consistency property. Specifically, it can detect any alternative outside a ball of radius \ (n^-1/2\) with respect to the proposed distance.
Jiang et al. (Sat,) studied this question.