Semiclassical limits of eigenfunctions on flat $n$-dimensional tori

Details Semiclassical limits of eigenfunctions on flat $n$-dimensional tori Semiclassical limits of eigenfunctions on flat $n$-dimensional tori

2011-10-04

arxiv.org/abs/1110.0871v1

Mathematics

Spectral Theory

10 pages; Canadian Mathematical Bulletin, 2011

Scientific paper

10.4153/CMB-2011-152-9

We provide a proof of the conjecture formulated in \cite{Jak97,JNT01} which states that on a $n$-dimensional flat torus $\T^{n}$, the Fourier transform of squares of the eigenfunctions $|\phi_\lambda|^2$ of the Laplacian have uniform $l^n$ bounds that do not depend on the eigenvalue $\lambda$. The proof is a generalization of the argument by Jakobson, {\it et al}. for the lower dimensional cases. These results imply uniform bounds for semiclassical limits on $\TT^{n+2}$. We also prove a geometric lemma that bounds the number of codimension-one simplices which satisfy a certain restriction on an $n$-dimensional sphere $S^n(\lambda)$ of radius $\sqrt{\lambda}$ and use it in the proof.

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