On dit que l'exposant p possède la propriété de Wiener si toute fonction périodique définie-positive qui est de puissance p-ième intégrable au voisinage de 0 l'est sur un intervalle de période. C'est le cas des entiers pairs, d'après un résultat classique de Wiener. Nous avons récemment obtenu des phénomènes de concentration des polynômes idempotents ou définis-positifs sur un ensemble mesurable du tore qui nous permettent de donner une version forte du fait que les exposants n'ont pas la propriété de Wiener, améliorant ainsi les résultats de Wainger et Shapiro.
We say that Wiener's property holds for the exponent whenever a positive definite function f, which belongs to for some , necessarily belongs to , too. This holds true for by a classical result of Wiener. Recently various concentration results were proved for idempotents and positive definite functions on measurable sets on the torus. They enable us to prove a sharp version of the failure of Wiener's property for , strengthening results of Wainger and Shapiro.
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@article{CRMATH_2008__346_1-2_39_0, author = {Bonami, Aline and R\'ev\'esz, Szil\'ard Gy.}, title = {Failure of {Wiener's} property for positive definite periodic functions}, journal = {Comptes Rendus. Math\'ematique}, pages = {39--44}, publisher = {Elsevier}, volume = {346}, number = {1-2}, year = {2008}, doi = {10.1016/j.crma.2007.11.013}, language = {en}, url = {http://www.numdam.org/articles/10.1016/j.crma.2007.11.013/} }
TY - JOUR AU - Bonami, Aline AU - Révész, Szilárd Gy. TI - Failure of Wiener's property for positive definite periodic functions JO - Comptes Rendus. Mathématique PY - 2008 SP - 39 EP - 44 VL - 346 IS - 1-2 PB - Elsevier UR - http://www.numdam.org/articles/10.1016/j.crma.2007.11.013/ DO - 10.1016/j.crma.2007.11.013 LA - en ID - CRMATH_2008__346_1-2_39_0 ER -
%0 Journal Article %A Bonami, Aline %A Révész, Szilárd Gy. %T Failure of Wiener's property for positive definite periodic functions %J Comptes Rendus. Mathématique %D 2008 %P 39-44 %V 346 %N 1-2 %I Elsevier %U http://www.numdam.org/articles/10.1016/j.crma.2007.11.013/ %R 10.1016/j.crma.2007.11.013 %G en %F CRMATH_2008__346_1-2_39_0
Bonami, Aline; Révész, Szilárd Gy. Failure of Wiener's property for positive definite periodic functions. Comptes Rendus. Mathématique, Tome 346 (2008) no. 1-2, pp. 39-44. doi : 10.1016/j.crma.2007.11.013. http://www.numdam.org/articles/10.1016/j.crma.2007.11.013/
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