Year: 2026
Type: preprint
Abstract: For $1\le p < \infty$, $φ_p$ is the function of minimal $L^p$ norm among all functions $f$ of exponential type at most $π$ for which $f(0)=1$. We start from the ansatz that the positive zeros $τ_n$ of $φ_p$ are close to \(n+1/p-1/2\) and use a weighted convex correction to first place them in an \(\ell^2\)-neighborhood of this sequence. A bootstrap argument then improves this to a {Poincaré asymptotic} expansion of $τ_n-(n+\frac1p-\frac12)$ in terms of odd powers of $(n+\frac1p-\frac12)^{-1}$. We also get precise information about the Fourier transform $\widehatφ_p$, a result that in particular implies that for all integers $n\ge 2$, $\widehatφ_{2n}$ is an integrable function which, when convolved with itself $2n-2$ times, is constant on the interval $[-π,π]$. In particular, we identify the extremizer in an autoconvolution problem posed by B. Green in 2001.
Source: arXiv (Cornell University)
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Awards: G3293145243, G4536355135
OpenAlex ID: W7222332939