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arXiv 0710.5583math.AP
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非线性Klein-Gordon方程驻波的山路变元不稳定性

Instability for standing waves of nonlinear Klein-Gordon equations via mountain-pass arguments

Louis Jeanjean, Stefan Le Coz

摘要:

我们引入山路型参数的背景下,轨道不稳定性的克莱因-戈登方程。我们的目的是通过两个例子来说明这些论点如何有助于简化证明并得出轨道稳定性/不稳定性的新结果。对于一个功率型非线性,我们证明了相关的固定方程的基态是极小的功能“行动”上的各种约束。对于一般的非线性方程,我们将Shatah在1985年证明的非线性Klein-Gordon方程定常解的经典不稳定性结果推广到维数N=2,其中维数N>2.

英文摘要:

We introduce mountain-pass type arguments in the context of orbital instability for Klein-Gordon equations. Our aim is to illustrate on two examples how these arguments can be useful to simplify proofs and derive new results of orbital stability/instability. For a power-type nonlinearity, we prove that the ground states of the associated stationary equation are minimizers of the functional "action" on a wide variety of constraints. For a general nonlinearity, we extend to the dimension N=2 the classical instability result for stationary solutions of nonlinear Klein-Gordon equations proved in 1985 by Shatah in dimension N>2.

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