A Schwarz-Pick lemma for minimal maps

Abstract

In this note, we prove a Schwarz-Pick type lemma for minimal maps between negatively curved Riemannian surfaces. More precisely, we prove that if $f:M \to N$ is a minimal map with bounded Jacobian between two complete negatively curved Riemann surfaces M and N whose sectional curvatures $\sigma_M$ and $\sigma_N$ satisfy $inf\sigma_M \ge sup\sigma_N$, then f is area decreasing.