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Isospectral deformations of closed Riemannian manifolds with different scalar curvature
dg-ga · Submitted 6 Oct 1997
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We construct the first examples of continuous families of isospectral Riemannian metrics that are not locally isometric on closed manifolds, more precisely, on $S^n\times T^m$, where $T^m$ is a torus of dimension $m\ge 2$ and $S^n$ is a sphere of dimension $n\ge 4$.
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The abstract, sentence by sentence
We construct the first examples of continuous families of isospectral Riemannian metrics that are not locally isometric on closed manifolds, more precisely, on $S^n\times T^m$, where $T^m$ is a torus of dimension $m\ge 2$ and $S^n$ is a sphere of dimension $n\ge 4$. These metrics are not locally homogeneous; in particular, the scalar curvature of each metric is nonconstant. For some of the deformations, the maximum scalar curvature changes during the deformation.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We construct the first examples of continuous families of isospectral Riemannian metrics that are not locally isometric on closed manifolds, more precisely, on $S^n\times T^m$, where $T^m$ is a torus of dimension $m\ge 2$ and $S^n$ is a sphere of dimension $n\ge 4$. | contribution 0.84 | 0.96 | 0.83 | asserted 1.00 |
| s1 | These metrics are not locally homogeneous; in particular, the scalar curvature of each metric is nonconstant. | result 0.91 | 0.87 | 0.13 | asserted 1.00 |
| s2 | For some of the deformations, the maximum scalar curvature changes during the deformation. | result 0.99 | 0.92 | 0.14 | asserted 0.91 |
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The paper
Original abstract
We construct the first examples of continuous families of isospectral Riemannian metrics that are not locally isometric on closed manifolds, more precisely, on $S^n\times T^m$, where $T^m$ is a torus of dimension $m\ge 2$ and $S^n$ is a sphere of dimension $n\ge 4$. These metrics are not locally homogeneous; in particular, the scalar curvature of each metric is nonconstant. For some of the deformations, the maximum scalar curvature changes during the deformation.
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