2001 Volume 53 Issue 2 Pages 307-320
We study the first positive eigenvalue λ1(p) of the Laplacian on p-forms for oriented closed Riemannian manifolds. It is known that the, inequality λ1(1)≤λ1(0) holds in general. In the present paper, a Riemannian manifold is said to have the gap if the strict inequality λ1(1)<λ1(0) holds. We show that any oriented closed manifold M with the first Betti number b1(M)=0 whose dimension is bigger than two, admits two Riemannian metrics, the one with the gap and the other without the gap.
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