Une mesure unitarisante de l'algèbre de Virasoro est une mesure de probabilité telle que l'espace L2 associé contienne un sous-espace fermé de fonctionnelles holomorphes sur lequel l'algèbre de Virasoro agit de façon unitaire. On a caractérisé les mesures unitarisantes par une formule d'intégration par parties qui a été explicitement calculée. Dans cette Note on montre qu'une mesure unitarisante doit être portée par le quotient du groupe des homéomorphismes du cercle par le sous-groupe des transformations de Möbius.
A unitarizing measure is a probability measure such that the associated L2 space contains a closed subspace of holomorphic functionals on which the Virasoro algebra acts unitarily. It has been shown that the unitarizing property is equivalent to an a priori given formula of integration by parts, which has been computed explicitly. We show in this Note that unitarizing measures must be supported by the quotient of the homeomorphism group of the circle by the subgroup of Möbius transformations.
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@article{CRMATH_2002__335_7_621_0, author = {Airault, H\'el\`ene and Malliavin, Paul and Thalmaier, Anton}, title = {Support of {Virasoro} unitarizing measures}, journal = {Comptes Rendus. Math\'ematique}, pages = {621--626}, publisher = {Elsevier}, volume = {335}, number = {7}, year = {2002}, doi = {10.1016/S1631-073X(02)02539-6}, language = {en}, url = {http://archive.numdam.org/articles/10.1016/S1631-073X(02)02539-6/} }
TY - JOUR AU - Airault, Hélène AU - Malliavin, Paul AU - Thalmaier, Anton TI - Support of Virasoro unitarizing measures JO - Comptes Rendus. Mathématique PY - 2002 SP - 621 EP - 626 VL - 335 IS - 7 PB - Elsevier UR - http://archive.numdam.org/articles/10.1016/S1631-073X(02)02539-6/ DO - 10.1016/S1631-073X(02)02539-6 LA - en ID - CRMATH_2002__335_7_621_0 ER -
%0 Journal Article %A Airault, Hélène %A Malliavin, Paul %A Thalmaier, Anton %T Support of Virasoro unitarizing measures %J Comptes Rendus. Mathématique %D 2002 %P 621-626 %V 335 %N 7 %I Elsevier %U http://archive.numdam.org/articles/10.1016/S1631-073X(02)02539-6/ %R 10.1016/S1631-073X(02)02539-6 %G en %F CRMATH_2002__335_7_621_0
Airault, Hélène; Malliavin, Paul; Thalmaier, Anton. Support of Virasoro unitarizing measures. Comptes Rendus. Mathématique, Tome 335 (2002) no. 7, pp. 621-626. doi : 10.1016/S1631-073X(02)02539-6. http://archive.numdam.org/articles/10.1016/S1631-073X(02)02539-6/
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