## Abstract We introduce a Littlewood–Paley decomposition related to any sub‐Laplacian on a Lie group __G__ of polynomial volume growth; this allows us to prove a Littlewood–Paley theorem in this general setting and to provide a dyadic characterization of Besov spaces __B__ ^__s,q__^ ~__p__~ (__G_
Riesz Transforms and Lie Groups of Polynomial Growth
✍ Scribed by A.F.M. ter Elst; Derek W. Robinson; Adam Sikora
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 264 KB
- Volume
- 162
- Category
- Article
- ISSN
- 0022-1236
No coin nor oath required. For personal study only.
✦ Synopsis
Let G be a Lie group of polynomial growth. We prove that the second-order Riesz transforms on L 2 (G ; dg) are bounded if, and only if, the group is a direct product of a compact group and a nilpotent group, in which case the transforms of all orders are bounded.
📜 SIMILAR VOLUMES
Let G be a real rank one semisimple Lie group and K a maximal compact subgroup of G. Radial maximal operators for suitable dilations, the heat and Poisson maximal operators, and the Riesz transform, which act on K-bi-invariant functions on G, satisfy the L p -norm inequalities for p>1 and a weak typ
Let \(\mu\) be an invariant measure on a regular orbit in a compact Lie group or in a Lie algebra. We prove sharp \(L^{\prime \prime}-L^{4}\) estimates for the convolution operators defined through \(\mu\). We also obtain similar results for the related Radon transform on the Lie algebra. 1945 Acade