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Lectures on Spaces of Nonpositive Curvature (Paperback, 1995 ed.)
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Lectures on Spaces of Nonpositive Curvature (Paperback, 1995 ed.)
Series: Oberwolfach Seminars, 25
Expected to ship within 10 - 15 working days
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Singular spaces with upper curvature bounds and, in particular,
spaces of nonpositive curvature, have been of interest in many
fields, including geometric (and combinatorial) group theory,
topology, dynamical systems and probability theory. In the first
two chapters of the book, a concise introduction into these spaces
is given, culminating in the Hadamard-Cartan theorem and the
discussion of the ideal boundary at infinity for simply connected
complete spaces of nonpositive curvature. In the third chapter,
qualitative properties of the geodesic flow on geodesically
complete spaces of nonpositive curvature are discussed, as are
random walks on groups of isometries of nonpositively curved
spaces. The main class of spaces considered should be precisely
complementary to symmetric spaces of higher rank and Euclidean
buildings of dimension at least two (Rank Rigidity conjecture). In
the smooth case, this is known and is the content of the Rank
Rigidity theorem. An updated version of the proof of the latter
theorem (in the smooth case) is presented in Chapter IV of the
book. This chapter contains also a short introduction into the
geometry of the unit tangent bundle of a Riemannian manifold and
the basic facts about the geodesic flow. In an appendix by Misha
Brin, a self-contained and short proof of the ergodicity of the
geodesic flow of a compact Riemannian manifold of negative
curvature is given. The proof is elementary and should be
accessible to the non-specialist. Some of the essential features
and problems of the ergodic theory of smooth dynamical systems are
discussed, and the appendix can serve as an introduction into this
theory.
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