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Continuous Families of Isospectral Metrics on Simply Connected Manifolds

Dorothee Schueth
Annals of Mathematics
Second Series, Vol. 149, No. 1 (Jan., 1999), pp. 287-308
Published by: Annals of Mathematics
DOI: 10.2307/121026
Stable URL: http://www.jstor.org/stable/121026
Page Count: 22
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Continuous Families of Isospectral Metrics on Simply Connected Manifolds
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Abstract

We construct continuous families of Riemannian metrics on certain simply connected manifolds with the property that the resulting Riemannian manifolds are pairwise isospectral for the Laplace operator acting on functions. These are the first examples of simply connected Riemannian manifolds without boundary which are isospectral, but not isometric. For example, we construct continuous isospectral families of metrics on the product of spheres S4× S3× S3. The metrics considered are not locally homogeneous. For a big class of such families, the set of critical values of the scalar curvature function changes during the deformation. Moreover, the manifolds are in general not isospectral for the Laplace operator acting on 1-forms.

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