Global $C^{1,\beta}$ and $W^{2, p}$ regularity for some singular Monge-Amp\`ere equations

We establish global $C^{1,\beta}$ and $W^{2, p}$ regularity for singular Monge-Amp\`ere equations of the form $$\det D^2 u \sim \text{dist}^{-\alpha}(\cdot,\partial\Omega),\quad \alpha\in (0, 1),$$ under suitable conditions on the boundary data and domains. Our results imply that the convex Aleksandrov solution to the singular Monge-Amp\`ere equation $$\det D^2 u=|u|^{-\alpha}\quad \text{in}\quad\Omega,\quad u=0\quad \text{in}\quad \partial\Omega, \quad \alpha\in (0, 1),$$ where $\Omega$ is a $C^3$, bounded, and uniformly convex domain, is globally $C^{1,\beta}$ and belongs to $W^{2, p}$ for all $p<1/\alpha$.