Hölder classes via semigroups and Riesz transforms
We define Hölder classes α associated with a Markovian semigroup and prove that, when the semigroup satisfies the 2 ≥ 0 condition, the Riesz transforms are bounded between the Hölder classes. As a consequence, this bound holds in manifolds with nonnegative Ricci curvature. We also show, without the...
| Autor: | |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/703082 |
| Acceso en línea: | http://hdl.handle.net/10486/703082 https://dx.doi.org/10.1007/s00209-022-02982-0 |
| Access Level: | acceso abierto |
| Palabra clave: | Harmonic analysis Markovian semigroups Von Neumann algebras Dirichlet-spaces Metric spaces Matemáticas |
| Sumario: | We define Hölder classes α associated with a Markovian semigroup and prove that, when the semigroup satisfies the 2 ≥ 0 condition, the Riesz transforms are bounded between the Hölder classes. As a consequence, this bound holds in manifolds with nonnegative Ricci curvature. We also show, without the need for extra assumptions on the semigroup, that a version of the Morrey inequalities is equivalent to the ultracontractivity property. This result extends the semigroup approach to the Sobolev inequalities laid by Varopoulos. After that, we study certain families of operators between the homogeneous Hölder classes. One of these families is given by analytic spectral multipliers and includes the imaginary powers of the generator, the other, by smooth multipliers analogous to those in the Marcienkiewicz theorem. Lastly, we explore the connection between the Hölder norm and Campanato’s formula for semigroups |
|---|