Harmonic analysis and partial differential equations / Analyse harmonique et équations aux dérivées partielles

Collection Harmonic analysis and partial differential equations / Analyse harmonique et équations aux dérivées partielles

Organisateur(s) Bernicot, Frédéric ; Martell, José Maria ; Monniaux, Sylvie ; Portal, Pierre
Date(s) 10/06/2024 - 14/06/2024
URL associée https://conferences.cirm-math.fr/2979.html
00:00:00 / 00:00:00
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One of the many meaningful equivalent norms on BMO uses a Carleson-measure condition on the gradient of the Poisson extension. This is closely related to the Dirichlet problem for the Laplacian in the upper half-space with boundary data in BMO. The Poisson semigroup provides the unique solution in appropriate classes, and it is bounded on BMO, that is, it propagates the space boundary space in the transversal direction. If the tangential Laplacian is replaced by a general elliptic operator in divergence form, boundedness of the Poisson semigroup on BMO can fail in any dimension n ≥ 3. Somewhat unexpectedly, its gradient persists to give rise to a Carleson measure with norm equivalent to the BMO-norm at the boundary in dimensions n = 3, 4 and hence a unique solution to the corresponding Dirichlet problem. In my talk, I will try to explain the broader context behind this phenomenon and why we still do not know if the result is sharp. Based on joint work with (of course) Pascal. It is Chapter 18 of our book but you will not have to read the seventeen preceding chapters to follow.

Informations sur la vidéo

Données de citation

  • DOI 10.24350/CIRM.V.20189103
  • Citer cette vidéo Egert, Moritz (11/06/2024). Unexpected norms on BMO and the Dirichlet problem. CIRM. Audiovisual resource. DOI: 10.24350/CIRM.V.20189103
  • URL https://dx.doi.org/10.24350/CIRM.V.20189103

Bibliographie

  • AUSCHER, Pascal et EGERT, Moritz. Identification of Adapted Hardy Spaces. In : Boundary Value Problems and Hardy Spaces for Elliptic Systems with Block Structure. Cham : Springer International Publishing, 2023. p. 111-140. - http://dx.doi.org/10.1007/978-3-031-29973-5_9

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