English

On a long range segregation model

Analysis of PDEs 2017-06-21 v3

Abstract

In this work we study the properties of segregation processes modeled by a family of equations L(ui)(x)=ui(x)Fi(u1,,uK)(x)i=1,,K L(u_i) (x) = u_i(x)\: F_i (u_1, \ldots, u_K)(x)\qquad i=1,\ldots, K where Fi(u1,,uK)(x)F_i (u_1, \ldots, u_K)(x) is a non-local factor that takes into consideration the values of the functions uju_j's in a full neighborhood of x.x. We consider as a model problem Δui\ep(x)=1\ep2ui\ep(x)ijH(uj\ep)(x)\Delta u_i^\ep (x) = \frac1{\ep^2} u_i^\ep (x)\sum_{i\neq j} H(u_j^\ep)(x) where \ep\ep is a small parameter and H(uj\ep)(x)H(u_j^\ep)(x) is for instance H(uj\ep)(x)=B1(x)uj\ep(y)dyH(u_j^\ep)(x)= \int_{\mathcal{B}_1 (x)} u_j^\ep (y)\, \text{d}y or H(uj\ep)(x)=supyB1(x)uj\ep(y).H(u_j^\ep)(x)= \sup_{y\in \mathcal{B}_1(x)} u_j^\ep (y). Here the set B1(x)\mathcal{B}_1(x) is the unit ball centered at xx with respect to a smooth, uniformly convex norm ρ\rho of n\real^n. Heuristically, this will force the populations to stay at ρ\rho-distance 1, one from each other, as \ep0\ep\to0.

Cite

@article{arxiv.1505.05433,
  title  = {On a long range segregation model},
  author = {Luis A. Caffarelli and Veronica Quitalo and Stefania Patrizi},
  journal= {arXiv preprint arXiv:1505.05433},
  year   = {2017}
}
R2 v1 2026-06-22T09:38:07.845Z