Published Paper

Inserted: 25 apr 2016
Last Updated: 31 aug 2017

Journal: Nonlinearity
Volume: 30
Number: 4
Pages: 1523-1535
Year: 2017

Abstract:

We investigate the shape of critical points for a free energy consisting of a nonlocal perimeter plus a nonlocal repulsive term. In particular, we prove that a volume-constrained critical point is necessarily a ball if its volume is sufficiently small with respect to its isodiametric ratio, thus extending a result previously known only for global minimizers.

We also show that, at least in one-dimension, there exist critical points with arbitrarily small volume and large isodiametric ratio. This example shows that a constraint on the diameter is, in general, necessary to establish the radial symmetry of the critical points.

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