A Simplification of the Aubin-Yau Proof and an Alternative $C^{0}$ Estimate for the Monge-Amp\`ere Equation on Calabi-Yau Manifolds

In this paper, a simplified exposition of the celebrated Aubin-Yau proof for the existence of Kähler-Einstein metrics is provided.

For the case of a compact Kähler manifold with vanishing first Chern class, the analysis presents an alternative formulation of the $C^0$ a priori estimate.

Instead of relying on the $L^{\infty}$ norm of the Kähler potential $F$ as in the original proof, a different uniform bound for the solution to the Monge-Ampère equation that depends only on the $L^{p}$ norm of $e^{F}$ is established.

This estimate has a stronger version established by Kołodziej in 1998.