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arXiv 1901.01461math.AP
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非局部非线性wave equations长波极限的比较

Comparison of nonlocal nonlinear wave equations in the long-wave limit

H. A. Erbay, S. Erbay, A. Erkip

摘要:

我们考虑一类通用的卷积型非局部波动方程模拟双向非线性波的传播。该模型涉及两个小的正参数测量的非线性和色散效应的相对强度。我们采用两个不同的核函数,具有类似的色散特性的长波极限和比较相应的解决方案的柯西问题具有相同的初始数据。我们严格证明了这两个解决方案之间的差异仍然很小,在一个合适的Sobolev规范在很长的时间间隔。特别是我们的结果表明,在长波极限,这种非局部方程的解决方案可以很好地近似的改进Boussinesq型方程。

英文摘要:

We consider a general class of convolution-type nonlocal wave equations modeling bidirectional nonlinear wave propagation. The model involves two small positive parameters measuring the relative strengths of the nonlinear and dispersive effects. We take two different kernel functions that have similar dispersive characteristics in the long-wave limit and compare the corresponding solutions of the Cauchy problems with the same initial data. We prove rigorously that the difference between the two solutions remains small over a long time interval in a suitable Sobolev norm. In particular our results show that, in the long-wave limit, solutions of such nonlocal equations can be well approximated by those of improved Boussinesq-type equations.

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