KELLAY, Karim; OMARI, Youssef

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KELLAY, Karim
Institut de Mathématiques de Bordeaux [IMB]

OMARI, Youssef

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Journal of Fourier Analysis and Applications. 2020, vol. 26, n° 1

Springer Verlag

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We give a complete characterization of Riesz bases of normalized reproducing kernels in the small Fock spaces $\mathcal{F}^2_{\varphi}$, the spaces of entire functions $f$ such that $f\mathrm{e}^{-\varphi} \in L^{2}(\mathbb{C})$, where $\varphi(z)= (\log^+|z|)^{\beta+1}$, $0< \beta \leq 1$.The first results in this direction are due to Borichev-Lyubarskii who showed that $\varphi$ with $\beta=1$ is the largest weight for which the corresponding Fock space admits Riesz bases of reproducing kernels. Later, such bases were characterized by Baranov-Dumont-Hartman-Kellay in the case when $\beta=1$. The present paper answers a question in Baranov et al. by extending their results for all parameters $\beta\in (0,1)$. Our results are analogous to those obtained for the case $\beta=1$ and those proved for Riesz bases of complex exponentials for the Paley-Wiener spaces. We also obtain a description of complete interpolating sequences in small Fock spaces with corresponding uniform norm.< Réduire

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Riesz bases of reproducing kernels in small Fock spaces

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