Boundary trace of positive solutions of semilinear elliptic equations in Lipschitz domains: the subcritical case

Marcus, Moshe¹  ; Veron, Laurent² 

¹ Department of Mathematics Technion Haifa, Israel
² Laboratoire de Mathématiques Faculté des Sciences Parc de Grandmont 37200 Tours, France

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 10 (2011) no. 4, pp. 913-984

Résumé

We study the generalized boundary value problem for nonnegative solutions of $-\Delta u+g\left(u\right)=0$ in a bounded Lipschitz domain $\Omega$, when $g$ is continuous and nondecreasing. Using the harmonic measure of $\Omega$, we define a trace in the class of outer regular Borel measures. We amphasize the case where $g\left(u\right)={\left|u\right|}^{q-1}u$, $q>1$. When $\Omega$ is (locally) a cone with vertex $y$, we prove sharp results of removability and characterization of singular behavior. In the general case, assuming that $\Omega$ possesses a tangent cone at every boundary point and $q$ is subcritical, we prove an existence and uniqueness result for positive solutions with arbitrary boundary trace.

Détail

Publié le : 2018-06-21

Classification : 35K60, 31A20, 31C15, 44A25, 46E35