Qualitative analysis of positive singular solutions for a critical elliptic system in a punctured ball
We study qualitative properties of positive singular solutions to a weakly coupled elliptic system with critical exponents in a punctured ball. We give a sharp criterion on the removablity of the isolated singularity. We prove that semi-singular solutions (i.e., solutions with one component bounded near the singularity and the other component unbounded near the singularity) do not exist for the dimensions $N\geq 4$ but do exist for $N=3$. Asymptotic symmetry and sharp pointwise estimates are also proved for singular solutions. These generalizes some classical results of (Caffarelli, Gidas and Spruck, Comm. Pure Appl. Math, 1989) to the weakly coupled system. Moreover, for the weakly coupled system, we demonstrate a novel phenomenon that does not arise in the scalar equation.