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Instability, index theorem, and exponential trichotomy for Linear Hamiltonian PDEs
About this Title
Zhiwu Lin and Chongchun Zeng
Publication: Memoirs of the American Mathematical Society
Publication Year:
2022; Volume 275, Number 1347
ISBNs: 978-1-4704-5044-1 (print); 978-1-4704-7013-5 (online)
DOI: https://doi.org/10.1090/memo/1347
Published electronically: December 13, 2021
Keywords: Linear Hamiltonian PDEs,
stability,
index formula,
exponential trichotomy,
structural decomposition,
spectral mapping,
Hamiltonian perturbations
Table of Contents
Chapters
- 1. Introduction
- 2. Main Results
- 3. Basic properties of Linear Hamiltonian systems
- 4. Finite dimensional Hamiltonian systems
- 5. Invariant subspaces
- 6. Structural decomposition
- 7. Exponential trichotomy
- 8. The index theorems and the structure of $E_{i\mu }$
- 9. Perturbations
- 10. Proof of Theorem where (H2.b) is weakened
- 11. Hamiltonian PDE models
- A. Appendix
Abstract
Consider a general linear Hamiltonian system $\partial _{t}u=JLu$ in a Hilbert space $X$. We assume that$\ L:X\rightarrow X^{\ast }$ induces a bounded and symmetric bi-linear form $\left \langle L\cdot ,\cdot \right \rangle$ on $X$, which has only finitely many negative dimensions $n^{-}(L)$. There is no restriction on the anti-self-dual operator $J:X^{\ast }\supset D(J)\rightarrow X$. We first obtain a structural decomposition of $X$ into the direct sum of several closed subspaces so that $L$ is blockwise diagonalized and $JL$ is of upper triangular form, where the blocks are easier to handle. Based on this structure, we first prove the linear exponential trichotomy of $e^{tJL}$. In particular, $e^{tJL}$ has at most algebraic growth in the finite co-dimensional center subspace. Next we prove an instability index theorem to relate $n^{-}\left ( L\right )$ and the dimensions of generalized eigenspaces of eigenvalues of$\ JL$, some of which may be embedded in the continuous spectrum. This generalizes and refines previous results, where mostly $J$ was assumed to have a bounded inverse. More explicit information for the indexes with pure imaginary eigenvalues are obtained as well. Moreover, when Hamiltonian perturbations are considered, we give a sharp condition for the structural instability regarding the generation of unstable spectrum from the imaginary axis. Finally, we discuss Hamiltonian PDEs including dispersive long wave models (BBM, KDV and good Boussinesq equations), 2D Euler equation for ideal fluids, and 2D nonlinear Schrödinger equations with nonzero conditions at infinity, where our general theory applies to yield stability or instability of some coherent states.- J. C. Alexander and R. Sachs, Linear instability of solitary waves of a Boussinesq-type equation: a computer assisted computation, Nonlinear World 2 (1995), no. 4, 471–507. MR 1360872
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