2018/08/28 by Cyrill B. Muratov, Theresa M. Simon, Thilo Simon · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Contact Mechanics and Variational Inequalities #Cutoff #Dipole #Isoperimetric inequality #Kernel (algebra) #Limiting #Nonlinear Partial Differential Equations #Numerical methods in inverse problems #Perimeter #Regularization (linguistics) #cond-mat.mes-hall #math-ph #math.AP #math.MP
paper · pdf · doi:10.1007/s00220-019-03455-y
published as Commun. Math. Phys. 372, 1059-1115 (2019) · 54 pages, 6 figures
arxiv created 2018/08/28 · openalex created_date 2018/09/07 · openalex publication_date 2019/04/30 · arxiv updated 2020/11/03 · openalex updated_date 2026/08/05
We study a geometric variational problem for sets in the plane in which the perimeter and a regularized dipolar interaction compete under a mass constraint. In contrast to previously studied nonlocal isoperimetric problems, here the nonlocal term asymptotically localizes and contributes to the perimeter term to leading order. We establish existence of generalized minimizers for all values of the dipolar strength, mass and regularization cutoff and give conditions for existence of classical minimizers. For subcritical dipolar strengths we prove that the limiting functional is a renormalized perimeter and that for small cutoff lengths all mass-constrained minimizers are disks. For critical dipolar strength, we identify the next-order Γ-limit when sending the cutoff length to zero and prove that with a slight modification of the dipolar kernel there exist masses for which classical minimizers are not disks.