Strongly Contracting Geodesics in a Tree of Spaces

Abstract

Let X be a tree of proper geodesic spaces with edge spaces strongly contracting and uniformly separated from each other by a number depending on the contraction function of edge spaces. Then we prove that the strongly contracting geodesics in vertex spaces are quasiconvex in X. We further prove that in X if all the vertex spaces are uniformly hyperbolic metric spaces then X is a hyperbolic metric space and vertex spaces are quasiconvex in X.

15 pages, 5 figures. Main Theorems are proved for more general cases. To appear in Proc. Indian Acad. Sci. (Math. Sci.)