Sign and area in nodal geometry of Laplace eigenfunctions

Details Sign and area in nodal geometry of Laplace eigenfunctions Sign and area in nodal geometry of Laplace eigenfunctions

2004-02-25

arxiv.org/abs/math/0402412v2

American Journal Math. 127 (2005), 879-910

Mathematics

Analysis of PDEs

35 pages, improvement of presentation, refinement of the section on the Donnelly-Fefferman inequality

Scientific paper

The paper deals with asymptotic nodal geometry for the Laplace-Beltrami operator on closed surfaces. Given an eigenfunction f corresponding to a large eigenvalue, we study local asymmetry of the distribution of sign(f) with respect to the surface area. It is measured as follows: take any disc centered at the nodal line {f=0}, and pick at random a point in this disc. What is the probability that the function assumes a positive value at the chosen point? We show that this quantity may decay logarithmically as the eigenvalue goes to infinity, but never faster than that. In other words, only a mild local asymmetry may appear. The proof combines methods due to Donnelly-Fefferman and Nadirashvili with a new result on harmonic functions in the unit disc.

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