%0 Journal Article
%T Exponential spectra in $L^2(¦Ì)$
%A Xing-Gang He
%A Chun-Kit Lai
%A Ka-Sing Lau
%J Mathematics
%D 2011
%I arXiv
%X Let $\mu$ be a Borel probability measure with compact support. We consider exponential type orthonormal bases, Riesz bases and frames in $L^2(\mu)$. We show that if $L^2(\mu)$ admits an exponential frame, then $\mu$ must be of pure type. We also classify various $\mu$ that admits either kind of exponential bases, in particular, the discrete measures and their connection with integer tiles. By using this and convolution, we construct a class of singularly continuous measures that has an exponential Riesz basis but no exponential orthonormal basis. It is the first of such kind of examples.
%U http://arxiv.org/abs/1110.1426v1