S. Gallot

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math.DG2008

Uniform growth of groups acting on Cartan-Hadamard spaces

Gérard Besson, Gilles Courtois, Sylvain Gallot

Let $X$ be an $n$ -dimensional simply connected manifold of pinched sectional curvature $- a^{2} \leq K \leq - 1$ . There exist a positive constant $C (n, a)$ such that for any finitely ge…

math.DG2005

Rigidity of amalgamated product in negative curvature

Gerard Besson, Gilles Courtois, Sylvain Gallot

Let $Γ$ be the fundamental group of a compact n-dimensional riemannian manifold X of sectional curvature bounded above by -1. We suppose that $Γ$ is a free product of its subgroup…