# Greatest least eigenvalue of the Laplacian on the Klein bottle

Abstract : We prove the following conjecture recently formulated by Jakobson, Nadirashvili and Polterovich \cite{JNP}: For any Riemannian metric $g$ on the Klein bottle $\mathbb{K}$ one has $\lambda_1 (\mathbb{K}, g) A (\mathbb{K}, g)\le 12 \pi E(2\sqrt 2/3),$ where $\lambda_1(\mathbb{K},g)$ and $A(\mathbb{K},g)$ stand for the least positive eigenvalue of the Laplacian and the area of $(\mathbb{K},g)$, respectively, and $E$ is the complete elliptic integral of the second kind. Moreover, the equality is uniquely achieved, up to dilatations, by the metric $g_0= {9+ (1+8\cos ^2v)^2\over 1+8\cos^2v} \left(du^2 + {dv^2\over 1+8\cos ^2v}\right),$ with $0\le u,v <\pi$. The proof of this theorem leads us to study a Hamiltonian dynamical system which turns out to be completely integrable by quadratures.
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https://hal.archives-ouvertes.fr/hal-00005692
Contributor : Ahmad El Soufi <>
Submitted on : Tuesday, June 28, 2005 - 7:47:55 PM
Last modification on : Thursday, November 14, 2019 - 1:25:23 AM
Long-term archiving on: Thursday, April 1, 2010 - 9:48:08 PM

### Citation

Ahmad El Soufi, Hector Giacomini, Mustapha Jazar. Greatest least eigenvalue of the Laplacian on the Klein bottle. 2005. ⟨hal-00005692⟩

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