On the Monge–Ampère equation with boundary blow-up: existence, uniqueness and asymptotics

We consider the Monge–Ampère equation det D2u = b(x)f(u) > 0 in Ω, subject to the singular boundary condition u = ∞ on ∂Ω. We assume that \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$b\in C^\infty(\overline{\Omega})$$\end{document} is positive in Ω and non-negative on ∂Ω. Under suitable conditions on f, we establish the existence of positive strictly convex solutions if Ω is a smooth strictly convex, bounded domain in \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb R}^N$$\end{document} with N ≥ 2. We give asymptotic estimates of the behaviour of such solutions near ∂Ω and a uniqueness result when the variation of f at ∞ is regular of index q greater than N (that is, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\lim_{u\to \infty} f(\lambda u)/f(u)=\lambda^q$$\end{document} , for every λ > 0). Using regular variation theory, we treat both cases: b > 0 on ∂Ω and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$b\equiv 0$$\end{document} on ∂Ω.