Abstract |
A beautiful theorem of Brooks says that, for a wide class of Riemannian
manifolds, the bottom of the spectrum of the Laplacian on a regular cover
is equal to the bottom of the spectrum of the base if and only if the
covering group is amenable. In the case where the base manifold is a
quotient of a simply connected manifold with pinched negative curvatures by
a convex co-compact group, we will give a analogous results for critical
exponents and for the growth of closed geodesics. This is joint work with
Rhiannon Dougall.
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