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Counting equilibria of the electrostatic potential

Authors: Herbert Edelsbrunner; Christopher Fillmore; Gonçalo Oliveira;

Counting equilibria of the electrostatic potential

Abstract

Abstract In 1873, James C. Maxwell conjectured that the electric field generated by point charges in generic position has at most isolated zeroes. The first (nonoptimal) upper bound was only obtained in 2007 by Gabrielov, Novikov, and Shapiro, who also posed two additional interesting conjectures. In this article, we give the best upper bound known to date on the number of zeroes of the electric field, and construct a counterexample to Conjecture 1.8 by Gabrielov, Novikov, and Shapiro that the number of equilibria cannot exceed those of the distance function defined by the unit point charges. Finally, we note that it is quite possible that Maxwell's quadratic upper bound is not tight, so it is prudent to find lower bounds. Hence, we also explore examples and construct configurations of charges achieving the highest ratios of the number of electric field zeroes by point charges found to this day.

Keywords

Computational Geometry (cs.CG), FOS: Computer and information sciences, J.2, I.3.5, FOS: Physical sciences, Mathematical Physics (math-ph), 31B05, 52B10, 52C35, 58E05, 78A30, 78-10, I.3.5; J.2, FOS: Mathematics, Computer Science - Computational Geometry, Mathematics - Combinatorics, Combinatorics (math.CO), Mathematical Physics

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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