Fundamental tone, concentration of density to points and conformal degeneration on surfaces

Details Fundamental tone, concentration of density to points and conformal degeneration on surfaces Fundamental tone, concentration of density to points and conformal degeneration on surfaces

2005-10-13

arxiv.org/abs/math/0510279v4

Canadian Journal of Mathematics, Vol 61 (2009), no. 3, 548-565

Mathematics

Spectral Theory

21 pages, 5 figures; typo corrected

Scientific paper

We study the effect of two types of degeneration of the Riemannian metric on the first eigenvalue of the Laplace operator on surfaces. In both cases we prove that the first eigenvalue of the round sphere is an optimal asymptotic upper bound. The first type of degeneration is concentration of the density to a point within a conformal class. The second is degeneration of the conformal class to the boundary of the moduli space on the torus and on the Klein bottle. In the latter, we follow the outline proposed by N. Nadirashvili in 1996.

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