Point configurations that are asymmetric yet balanced

Details Point configurations that are asymmetric yet balanced Point configurations that are asymmetric yet balanced

2008-12-13

arxiv.org/abs/0812.2579v2

Proceedings of the American Mathematical Society 138 (2010), 2863-2872

Mathematics

Metric Geometry

10 pages, to appear in Proceedings of the AMS

Scientific paper

10.1090/S0002-9939-10-10284-6

A configuration of particles confined to a sphere is balanced if it is in equilibrium under all force laws (that act between pairs of points with strength given by a fixed function of distance). It is straightforward to show that every sufficiently symmetrical configuration is balanced, but the converse is far from obvious. In 1957 Leech completely classified the balanced configurations in R^3, and his classification is equivalent to the converse for R^3. In this paper we disprove the converse in high dimensions. We construct several counterexamples, including one with trivial symmetry group.

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