Complex Monge-Amp{è}re equations with boundary values: a variational approach

Abstract: Let $Ω$ ___ C n be a bounded hyperconvex domain and $Φ$\,: $Ω$ $\rightarrow$ R a maximal plurisubharmonic function in $Ω$ (possibly unbounded). We introduce a new class E 1 $Φ$ ($Ω$) of plurisubharmonic functions with boundary values equal to $Φ$ in the sense of Cegrell and finite $Φ$-energy on $Ω$. Then given a Borel measure $μ$ on $Ω$, we apply a variational approach to prove that $μ$ is the Monge-Amp{è}re measure of a function u $\in$ E 1 $Φ$ ($Ω$) if and only if it satisfies the integrability condition We also establish a quantitative version of this condition extending previous results of Cegrell and others. Using a logarithmic transformation, we obtain analogous results for the real Monge-Amp{è}re equations with (unbounded) boundary data.