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Existence and non-existence of solutions for a class of Monge-Ampère equations. (English) Zbl 1165.35023
Summary: We study the boundary value problems for Monge-Ampère equations: $$\det D^2u=e^{-u}$$ in $$\Omega \subset \mathbb R^n$$, $$n \geq 1$$, $$u|_{\partial \Omega }=0$$. First we prove by the argument of moving plane that any solution on the ball is radially symmetric. Then we show that there exists a critical radius such that if the radius of a ball is smaller than this critical value then a solution exists, and vice versa. Using the comparison between domains we can prove that this phenomenon occurs for every domain. Finally we consider an equivalent problem with a parameter $$\det D^2u=e^{-tu}$$ in $$\Omega$$, $$u|_{\partial \Omega }=0$$, $$t\geq 0$$. By using Lyapunov-Schmidt reduction method we get the local structure of the solutions near a degenerate point; by Leray-Schauder degree theory, a priori estimate and bifurcation theory we get the global structure.

##### MSC:
 35J65 Nonlinear boundary value problems for linear elliptic equations 35J60 Nonlinear elliptic equations 35J20 Variational methods for second-order elliptic equations 58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces 35B45 A priori estimates in context of PDEs 35B32 Bifurcations in context of PDEs
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