Evans functions for periodic waves on infinite cylindrical domains

Evans functions for periodic waves on infinite cylindrical domains
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无限圆柱域上周期波的埃文斯函数

DOI:
10.1016/j.jde.2009.08.003
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发表时间:
2010
影响因子:
2.4
通讯作者:
Bjorn Sandstede
Bjorn Sandstede
中科院分区:
数学2区
文献类型:
--
作者:
M. Oh;Bjorn Sandstede

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利用Galerkin近似,构造了无限长圆柱域上空间周期波的Evans函数。文中还证明了Evans函数可以用来定义周期波的奇偶指数,该指数检测周期波是否允许奇数个实不稳定本征值。对于波的存在问题,这个奇偶指数只依赖于局部信息:特别是它使用了关于零附近的线性色散关系和不稳定和稳定流形沿非线性波的方向性的信息。将所得结果应用于无限长条上标量方程的小振幅波列。
Using Galerkin approximations, an Evans function for spatially periodic waves on infinite cylindrical domains is constructed. It is also shown that the Evans function can be used to define a parity index for periodic waves that detects whether the wave admits an odd number of real unstable eigenvalues. This parity index depends only on local information for the existence problem of the wave: in particular, it uses information about the linear dispersion relation near zero and the orientability of the unstable and stable manifolds along the nonlinear wave. The results are applied to small-amplitude wave trains for a scalar equation on an infinite strip.
通道中椭圆特征值问题的无限维埃文斯函数理论
DOI: --
发表时间: 2006
期刊: J. Differential Equations no.1,225
影响因子: --
作者:
Deng;Jian; Nii;Shunsaku
通讯作者: Shunsaku