Asphericity lifts the degeneracy among ordering mechanisms on curved surfaces
Abstract
Spherical surfaces conceal the one-body signature of particle organization: area-uniform, conductor, and curvature-weighted measures coincide there, so the ordering mechanism leaves no trace in the density. Hard spheres and Coulomb charges confined to the sphere thus produce identical mean densities, and distinctions between their particle arrangements appear only in many-body correlations. Aspherical deformation lifts this degeneracy, and we show that on an ellipsoid, different ordering mechanisms separate by virtue of a single exponent p of the distance from the shell center to its tangent plane. To leading order in deformation, the characteristic exponent p can be obtained both from the quadrupole of the spherical structure factor and from the radius of gyration. Two interaction families demonstrate how this can be realized in practice: the Riesz s-energy, whose limiting measure is determined by the power s and exhibits a transition at s=d=2, and the screened Coulomb potential, whose measure and thus the characteristic exponent are tuned continuously by the salt concentration. The value of the characteristic exponent p positions the arrangement of particles between the conductor and packing limits, and its response to a control parameter such as salt concentration can be used experimentally to identify the interaction family.
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BibTeX
@misc{bozic2026asphericity,
title = {{Asphericity lifts the degeneracy among ordering mechanisms on curved surfaces}},
author = {Anže Božič},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.27520},
eprint = {2608.27520},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.27520},
}
RIS
TY - UNPB
TI - Asphericity lifts the degeneracy among ordering mechanisms on curved surfaces
AU - Anže Božič
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2608.27520
UR - https://arxiv.org/abs/2608.27520
AB - Spherical surfaces conceal the one-body signature of particle organization: area-uniform, conductor, and curvature-weighted measures coincide there, so the ordering mechanism leaves no trace in the density. Hard spheres and Coulomb charges confined to the sphere thus produce identical mean densities, and distinctions between their particle arrangements appear only in many-body correlations. Aspherical deformation lifts this degeneracy, and we show that on an ellipsoid, different ordering mechanisms separate by virtue of a single exponent p of the distance from the shell center to its tangent plane. To leading order in deformation, the characteristic exponent p can be obtained both from the quadrupole of the spherical structure factor and from the radius of gyration. Two interaction families demonstrate how this can be realized in practice: the Riesz s-energy, whose limiting measure is determined by the power s and exhibits a transition at s=d=2, and the screened Coulomb potential, whose measure and thus the characteristic exponent are tuned continuously by the salt concentration. The value of the characteristic exponent p positions the arrangement of particles between the conductor and packing limits, and its response to a control parameter such as salt concentration can be used experimentally to identify the interaction family.
ER -