Mathematical Research Letters

Volume 15, Issue 3, May 2008 pp. 471-483.

A critical-exponent Balian--Low theorem

Authors: S. Zubin Gautam
Author institution: University of California at Los Angeles

Summary: Using a variant of the Sobolev Embedding Theorem, we prove an uncertainty principle related to Gabor systems that generalizes the Balian--Low Theorem. Namely, if $f\in H^{p/2}(\R)$ and $\hat f\in H^{p'/2}(\R)$ with $1<p< \infty$, $\frac{1}{p}+\frac{1}{p'}=1$, then the Gabor system $\mathcal G(f,1,1)$ is not a frame for $L^2(\R)$. In the $p=1$ case, we obtain a generalization of the result in \cite{bcps}.

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