The ellipse law: Kirchhoff meets dislocations

Author: 

Carrillo de la Plata, J
Mateu, J
Mora, M
Rondi, L
Scardia, L
Verdera, J

Publication Date: 

24 April 2019

Journal: 

Communications in Mathematical Physics

Last Updated: 

2020-11-13T18:47:30.16+00:00

Issue: 

2

Volume: 

373

DOI: 

10.1007/s00220-019-03368-w

page: 

507-524

abstract: 

In this paper we consider a nonlocal energy Iα whose kernel is obtained by adding to the Coulomb potential an anisotropic term weighted by a parameter α∈R. The case α = 0 corresponds to purely logarithmic interactions, minimised by the circle law; α = 1 corresponds to the energy of interacting dislocations, minimised by the semi-circle law. We show that for α∈(0,1) the minimiser is the normalised characteristic function of the domain enclosed by the ellipse of semi-axes 1−α−−−−−√ and 1+α−−−−−√. This result is one of the very few examples where the minimiser of a nonlocal anisotropic energy is explicitly computed. For the proof we borrow techniques from fluid dynamics, in particular those related to Kirchhoff’s celebrated result that domains enclosed by ellipses are rotating vortex patches, called Kirchhoff ellipses.

Symplectic id: 

1098228

Submitted to ORA: 

Submitted

Publication Type: 

Journal Article