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Intersection bounds for nodal sets of planar Neumann eigenfunctions with interior analytic curves

Spectral Theory 2014-07-02 v2 Mathematical Physics Analysis of PDEs Differential Geometry Functional Analysis math.MP

Abstract

Let ΩR2 \Omega \subset R^2 be a bounded piecewise smooth domain and ϕλ\phi_\lambda be a Neumann (or Dirichlet) eigenfunction with eigenvalue λ2\lambda^2 and nodal set Nϕλ=xΩ;ϕλ(x)=0.{ N}_{\phi_{\lambda}} = {x \in \Omega; \phi_{\lambda}(x) = 0}. Let HΩH \subset \Omega be an interior CωC^{\omega} curve. Consider the intersection number n(λ,H):=#(HNϕλ). n(\lambda,H):= \# (H \cap N_{\phi_{\lambda}} ). We first prove that for general piecewise-analytic domains, and under an appropriate "goodness" condition on HH, n(λ,H)=OH(λ)() n(\lambda,H) = {\mathcal O}_H(\lambda) (*) as λ.\lambda \rightarrow \infty. We then prove that the bound in ()(*) is satisfied in the case of quantum ergodic (QE) sequences of interior eigenfunctions, provided Ω\Omega is convex and HH has strictly positive geodesic curvature.

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Cite

@article{arxiv.1211.3395,
  title  = {Intersection bounds for nodal sets of planar Neumann eigenfunctions with interior analytic curves},
  author = {Layan El-Hajj and John A. Toth},
  journal= {arXiv preprint arXiv:1211.3395},
  year   = {2014}
}

Comments

40 pages, 1 figure