Group Theoretic Constructions of Singular Set in a Long Range Segregation Model

In this paper, we construct several explicit examples of singular sets of Hausdorff dimension $(n-2)$ in $\mathbb{R}^n$ on free boundaries for an elliptic system modeling long range segregation.

The system has been previously studied by Caffarelli, Patrizi and Quitalo in \cite{CL2} for the regularity of the free boundary in dimension two, and by the author and Torres in \cite{ChPaTo26_2} for the partial regularity in higher dimensions.

However, the dimension of the singular set is unknown, and no concrete examples of singular set are known in the literature due to the nonlocal nature of the elliptic system.

In this paper, we overcome this difficulty by rigidity and finite group action.

As a byproduct of our result, we see that singular points can exist for the model in any dimensions.

We also show that our method can be applied to the study of the singular set in the adjacent model.

Finally, we also discuss some related open problems for future studies.