Constructive stability results in interpolation inequalities and explicit improvements of decay rates of fast diffusion equations
We provide a scheme of a recent stability result for a family of Gagliardo-Nirenberg-Sobolev (GNS) inequalities, which is equivalent to an improved entropy – entropy production inequality associated with an appropriate fast diffusion equation (FDE) written in self-similar variables. This result can...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/706813 |
| Acceso en línea: | http://hdl.handle.net/10486/706813 https://dx.doi.org/10.3934/dcds.2022093 |
| Access Level: | acceso abierto |
| Palabra clave: | Gagliardo-Nirenberg-Sobolev inequality Harnack Principle Caffarelli-Kohn-Nirenberg inequality Entropy Methods Fast Diffusion Equation Hardy-Poincaré Inequalities Rates of Convergence Self-Similar Solutions Spectral Gap Stability Matemáticas |
| Sumario: | We provide a scheme of a recent stability result for a family of Gagliardo-Nirenberg-Sobolev (GNS) inequalities, which is equivalent to an improved entropy – entropy production inequality associated with an appropriate fast diffusion equation (FDE) written in self-similar variables. This result can be rephrased as an improved decay rate of the entropy of the solution of (FDE) for well prepared initial data. There is a family of Caffarelli-Kohn-Nirenberg (CKN) inequalities which has a very similar structure. When the exponents are in a range for which the optimal functions for (CKN) are radially symmetric, we investigate how the methods for (GNS) can be extended to (CKN). In particular, we prove that the solutions of the evolution equation associated to (CKN) also satisfy an improved decay rate of the entropy, after an explicit delay. However, the improved rate is obtained without assuming that initial data are well prepared, which is a major difference with the (GNS) case |
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