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Control and stablization of some hyperbolic and dispersive equations

Abstract : In this thesis, we deal with the control and stabilization for certain hyperbolic and dispersive partial differential equations. The first part of this work is devoted to the stabilization of hyperbolic Stokes equation. The propagation of singularity for semi-classical Stokes system is established in Chapter 1. This will be done by adpating the strategy of Ivrii and Melrose-Sjöstrand. However,compared to the Laplace operator, the difficulty is caused by the pressure term which has non-trivial impact to solutions concentrated near the boundary. We apply parametrix construction to resolve the issue in elliptic and hyperbolic regions. We next adapte a fine micro-local decomposition for solutions concentrated near the glancing set. The impact of pressure to the solution is then well controled by geometric considerations. As a consequence of the main theorem in Chapter 1, we prove the stabilization of hyperbolic Stokes equation under geometric control condition in Chapter 2. The second part is devoted to the controllability of Kadomtsev–Petviashvili(KP in short) equations. In Chapter 3, the controllability in L 2 (T) from vertical strip is proved using semi-classical analysis. Additionally, a negative result for the controllability in L^2 (T) from horizontal strip is also showed. In Chapter 4, we prove the exact controllability of linear KP-I equation if the control input is added on a vertical domain. It is an interesting model in which the group velocity may degenerate. More generally, we have obtained the least dispersion needed to insure observability for fractional linear KP I equation. Finally in Chapter 5, we prove exact controllability and stabilization of KP-II equation and fifth order KP-II equation for any size of initial data in Sobolev spaces with additional partial compactness conditions. This extends the exact controllability for small data obtained in Chapter 3.compactness condition. This extends the exact controllability for small data obtained in Chapter 3.
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Chenmin Sun. Control and stablization of some hyperbolic and dispersive equations. Analysis of PDEs [math.AP]. Université Côte d'Azur, 2018. English. ⟨NNT : 2018AZUR4047⟩. ⟨tel-02002152⟩

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