Counting Nodal Lines Which Touch the Boundary of an Analytic Domain

By J. Toth, Steve Zelditch. 2007

91 citations recorded by the source corpus.

We consider the zeros on the boundary $\partial \Omega$ of a Neumann eigenfunction $\phi_{\lambda}$ of a real analytic plane domain $\Omega$. We prove that the number of its boundary zeros is $O (\lambda)$ where $-\Delta \phi_{\lambda} = \lambda^2 \phi_{\lambda}$. We also prove that the number of boundary critical points of either a Neumann or Dirichlet eigenfunction is $O(\lambda)$. It follows that the number of nodal lines of $\phi_{\lambda}$ (components of the nodal set) which touch the boundary is of order $\lambda$. This upper bound is of the same order of magnitude as the length of the total nodal line, but is the square root of the Courant bound on the number of nodal components in the interior. More generally, the results are proved for piecewise analytic domains.

Subfields: Applied Mathematics, Computational Theory and Mathematics, Geometry and Topology

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In Applied Mathematics

  1. Peter Sarnak

In Computational Theory and Mathematics

  1. Peter Sarnak

In Geometry and Topology

  1. A. Reznikov
  2. Amit Ghosh
  3. Peter Sarnak
  4. P. Michel
  5. Alex Kontorovich
  6. V. Blomer
  7. Gergely Harcos
  8. Kannan Soundararajan

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