Closed nodal lines and interior hot spots of the second eigenfunction of the Laplacian on surfaces

Details Closed nodal lines and interior hot spots of the second eigenfunction of the Laplacian on surfaces Closed nodal lines and interior hot spots of the second eigenfunction of the Laplacian on surfaces

2000-09-15

arxiv.org/abs/math/0009153v1

Indiana Univ. Math. J. 51 (2002), 305--316

Mathematics

Spectral Theory

10 pages

Scientific paper

We build a one-parameter family of S^{1}-invariant metrics on the unit disc with fixed total area for which the second eigenvalue of the Laplace operator in the case of both Neumann and Dirichlet boundary conditions is simple and has an eigenfunction with a closed nodal line. In the case of Neumann boundary conditions, we also prove that this eigenfunction attains its maximum at an interior point, and thus provide a counterexample to the hot spots conjecture on a simply connected surface. This is a consequence of the stronger result that within this family of metrics any given (finite) number of S^{1}-invariant eigenvalues can be made to be arbitrarily small, while the non-invariant spectrum becomes arbitrarily large.

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