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arXiv · 2609.39356

Global dynamics near solitary waves for the generalized Boussinesq equation under even-odd perturbations

Xiaoguang Li·Jun Wang
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Abstract

We study the global dynamics of the generalized Boussinesq equation near standing solitary waves. For even-odd perturbations, Maulen [J. Math. Pures Appl. 177 (2023)] constructed an asymptotically stable center-stable manifold M near the solitary wave Q. We complete this local description by proving that any sufficiently small even-odd perturbation of Q lying outside M either scatters in the energy space as t -> +infinity or blows up in finite time. The proof relies on two main ingredients. First, we classify even-odd solutions with energy below the ground-state energy by identifying two invariant regions, associated with scattering and blow-up, respectively. Second, we establish a one-pass theorem in one dimension: a non-scattering solution cannot re-enter a suitably chosen neighborhood of the solitary wave once it has left that neighborhood. Consequently, the solution remains confined to one of the two invariant regions. Together with the classification above, this yields a dichotomy between scattering and blow-up outside M.

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Xiaoguang Li, Jun Wang. 2026-09-30. Global dynamics near solitary waves for the generalized Boussinesq equation under even-odd perturbations. https://arxiv.org/abs/2609.39356

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