Convexity of asymptotic geodesics in Hilbert Geometry

Abstract

If $\Omega$ is the interior of a convex polygon in ${\mathbb{R}}^2$ and $f,g$ two asymptotic geodesics, we show that the distance function $d\left(f\left(t\right),g\left(t\right)\right)$ is convex for $t$ sufficiently large. The same result is obtained in the case $\partial \Omega$ is of class $C^2$ and the curvature of $\partial \Omega$ at the point $f\left(\infty \right)=g\left(\infty \right)$ does not vanish. An example is provided for the necessity of the curvature assumption.

25 pages, 7 figures