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arXiv nlin/0209022nlin.PS
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一般五阶KdV方程中嵌入孤子的半稳定性

Semi-stability of embedded solitons in the general fifth-order KdV equation

Yu Tan, Jianke Yang, Dmitry Pelinovsky

摘要:

研究了一般哈密顿五阶KdV方程中嵌入孤子的扰动演化。当嵌入孤子受到微扰时,它会产生单向连续波辐射。结果表明,辐射振幅一般不是最小的。导出了受扰嵌入孤子速度的动力学方程。该方程表明,中性稳定的嵌入孤子实际上是半稳定的。当微扰增加嵌入孤子的动量时,微扰态渐近地接近嵌入孤子,而当微扰减小嵌入孤子的动量时,微扰态衰减为辐射。类初始条件诱导孤子衰减或持久性也被确定。我们的分析结果证实了直接数值模拟的五阶KdV方程。

英文摘要:

Evolution of perturbed embedded solitons in the general Hamiltonian fifth-order Korteweg--de Vries (KdV) equation is studied. When an embedded soliton is perturbed, it sheds a one-directional continuous-wave radiation. It is shown that the radiation amplitude is not minimal in general. A dynamical equation for velocity of the perturbed embedded soliton is derived. This equation shows that a neutrally stable embedded soliton is in fact semi-stable. When the perturbation increases the momentum of the embedded soliton, the perturbed state approaches asymptotically the embedded soliton, while when the perturbation reduces the momentum of the embedded soliton, the perturbed state decays into radiation. Classes of initial conditions to induce soliton decay or persistence are also determined. Our analytical results are confirmed by direct numerical simulations of the fifth-order KdV equation.

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