Analysis of joint spectral multipliers on Lie groups of polynomial growth
[Analyse de multiplicateurs spectraux conjoints sur des groupes de Lie à croissance polynomiale]
Annales de l'Institut Fourier, Tome 62 (2012) no. 4, pp. 1215-1263.

On étudie la bornitude L p (1<p<) des opérateurs de la forme m(L 1 ,,L n ) pour un système commutatif L 1 ,,L n d’opérateurs différentiels autoadjoints invariants à gauche sur un groupe de Lie G à croissance polynomiale, qui engendrent une algèbre contenant un opérateur sous-coercif pondéré. En particulier, quand G est un groupe homogène et L 1 ,,L n sont homogènes, on prouve des analogues des theorèmes de multiplicateurs de Mihlin-Hörmander et Marcinkiewicz.

We study the problem of L p -boundedness (1<p<) of operators of the form m(L 1 ,,L n ) for a commuting system of self-adjoint left-invariant differential operators L 1 ,,L n on a Lie group G of polynomial growth, which generate an algebra containing a weighted subcoercive operator. In particular, when G is a homogeneous group and L 1 ,,L n are homogeneous, we prove analogues of the Mihlin-Hörmander and Marcinkiewicz multiplier theorems.

DOI : 10.5802/aif.2721
Classification : 43A22, 22E30, 42B15
Keywords: spectral multipliers, joint functional calculus, differential operators, Lie groups, polynomial growth, singular integral operators
Mot clés : multiplicateurs spectraux, calcul fonctionnel conjoint, opérateurs différentiels, groupes de Lie, croissance polynomiale, opérateurs intégraux singuliers
Martini, Alessio 1

1 Scuola Normale Superiore Piazza dei Cavalieri, 7 56126 Pisa (Italy)
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Martini, Alessio. Analysis of joint spectral multipliers on Lie groups of polynomial growth. Annales de l'Institut Fourier, Tome 62 (2012) no. 4, pp. 1215-1263. doi : 10.5802/aif.2721. http://www.numdam.org/articles/10.5802/aif.2721/

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