Failure of Wiener's property for positive definite periodic functions

Abstract : We say that Wiener's property holds for the exponent $p>0$ if we have that whenever a positive definite function $f$ belongs to $L^p(-\varepsilon,\varepsilon)$ for some $\varepsilon>0$, then $f$ necessarily belongs to $L^p(\TT)$, too. This holds true for $p\in 2\NN$ by a classical result of Wiener. Recently various concentration results were proved for idempotents and positive definite functions on measurable sets on the torus. These new results enable us to prove a sharp version of the failure of Wiener's property for $p\notin 2\NN$. Thus we obtain strong extensions of results of Wainger and Shapiro, who proved the negative answer to Wiener's problem for $p\notin 2\NN$.
keyword : 42A05 42A32
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Submitted on : Sunday, November 4, 2007 - 5:49:01 PM
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  • HAL Id : hal-00184970, version 1
  • ARXIV : 0711.0676

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Aline Bonami, Szilárd Gy. Révész. Failure of Wiener's property for positive definite periodic functions. 2007. ⟨hal-00184970⟩

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