Complete classification of the positive solutions of $-Δu + u^q=0$

Details Complete classification of the positive solutions of $-Δu + u^q=0$ Complete classification of the positive solutions of $-Δu + u^q=0$

2010-09-20

arxiv.org/abs/1009.3872v2

Mathematics

Analysis of PDEs

26 pages

Scientific paper

We study the equation $-\Delta u+u^q=0$, $q>1$, in a bounded $C^2$ domain $\Omega\subset R^N$. A positive solution of the equation is moderate if it is dominated by a harmonic function and $\sigma$-moderate if it is the limit of an increasing sequence of moderate solutions. It is known that in the sub-critical case, $12$. In this paper we prove that, for all $q\ge q_c$, every positive solution is $\sigma$-moderate. We use purely analytic techniques which apply to the full super-critical range. The main tools come from linear and non-linear potential theory. Combined with previous results, this establishes a 1-1 correspondence between positive solutions and their boundary traces in the sense of [35].

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