Equilibrium points of a singular cooperative system with free boundary

TL;DR

This paper studies energy-minimizing maps with singular Euler equations, focusing on regularity and free boundary behavior using advanced mathematical tools, setting a foundation for future research in this area.

Contribution

It introduces a framework for analyzing singular cooperative systems with free boundaries, emphasizing regularity results and methodological approaches.

Findings

Established regularity of solutions

Analyzed free boundary properties

Developed techniques using monotonicity and epiperimetric inequalities

Abstract

In this paper we initiate the study of maps minimising the energy $$ \int_{D} (|\nabla \u|^2+2|\u|)\ dx. $$ which, due to Lipschitz character of the integrand, gives rise to the singular Euler equations $$ \Delta \u=\frac{\u}{|\u|}\chi_{\left\lbrace |\u|>0\right\rbrace}, \qquad \u = (u_1, \cdots, u_m) \ . $$ Our primary goal in this paper is to set up a road map for future developments of the theory related to such energy minimising maps. Our results here concern regularity of the solution as well as that of the free boundary. They are achieved by using monotonicity formulas and epiperimetric inequalities, in combination with geometric analysis.