Minimal Riesz energy on the sphere for axis-supported external fields

Details Minimal Riesz energy on the sphere for axis-supported external fields Minimal Riesz energy on the sphere for axis-supported external fields

2009-02-09

arxiv.org/abs/0902.1558v1

Physics

Mathematical Physics

42 pages, 2 figures

Scientific paper

We investigate the minimal Riesz s-energy problem for positive measures on the d-dimensional unit sphere S^d in the presence of an external field induced by a point charge, and more generally by a line charge. The model interaction is that of Riesz potentials |x-y|^(-s) with d-2 <= s < d. For a given axis-supported external field, the support and the density of the corresponding extremal measure on S^d is determined. The special case s = d-2 yields interesting phenomena, which we investigate in detail. A weak* asymptotic analysis is provided as s goes to (d-2)^+.

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