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arXiv 0711.2134math.APmath-phmath.MP
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能量空间中格点孤子的渐近稳定性

Asymptotic stability of lattice solitons in the energy space

Tetsu Mizumachi

摘要:

在能量空间中建立了Toda格点方程1-孤子解的轨道稳定性和渐近稳定性以及FPU格点方程的小孤波.与类似的哈密顿偏微分方程不同,格点方程不守恒动量。此外,Toda晶格方程是一个双向模型,不符合Grillakis,Shatah和Strauss关于哈密顿系统的现有理论。为了证明1-孤子解的稳定性,我们将1-孤子周围的解分裂成一个比主孤波运动更慢的小解和一个指数局部化的部分。我们应用衰减估计的解决方案的线性化户田方程,最近已经证明了水町和Pego估计本地化的部分。我们改进了Friesecke和Pego关于加权空间中FPU格的渐近稳定性结果。

英文摘要:

Orbital and asymptotic stability for 1-soliton solutions to the Toda lattice equations as well as small solitary waves to the FPU lattice equations are established in the energy space. Unlike analogous Hamiltonian PDEs, the lattice equations do not conserve momentum. Furthermore, the Toda lattice equation is a bidirectional model that does not fit in with existing theory for Hamiltonian system by Grillakis, Shatah and Strauss. To prove stability of 1-soliton solutions, we split a solution around a 1-soliton into a small solution that moves more slowly than the main solitary wave, and an exponentially localized part. We apply a decay estimate for solutions to a linearized Toda equation which has been recently proved by Mizumachi and Pego to estimate the localized part. We improve the asymptotic stability results for FPU lattices in a weighted space obtained by Friesecke and Pego.

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