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arXiv 1009.0977math.DSmath-phmath.MP
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同宿轨道分岔的解析和代数条件I:鞍点平衡

Analytic and algebraic conditions for bifurcations of homoclinic orbits I: Saddle equilibria

David Blazquez-Sanz, Kazuyuki Yagasaki

摘要:

研究了一类四维系统的同宿轨到双曲鞍点平衡点的分支,这些系统可以是Hamilton系统,也可以是非Hamilton系统。在哈密顿系统中,只需要一个参数就足以处理这些类型的分叉,而在一般系统中需要两个参数。我们应用一个版本的Melnikov的方法,由于Gruendler获得鞍结和干草叉类型的同宿轨道的分歧结果。进一步证明了如果这些分支发生,那么在同宿轨道位于解析不变流形上的假设下,围绕同宿轨道的变分方程在微分伽罗瓦论意义下是可积的.我们用一个耦合实Ginzburg-Landau偏微分方程定态的例子来说明我们的理论,并通过数值计算来证明理论结果。

英文摘要:

We study bifurcations of homoclinic orbits to hyperbolic saddle equilibria in a class of four-dimensional systems which may be Hamiltonian or not. Only one parameter is enough to treat these types of bifurcations in Hamiltonian systems but two parameters are needed in general systems. We apply a version of Melnikov's method due to Gruendler to obtain saddle-node and pitchfork types of bifurcation results for homoclinic orbits. Furthermore we prove that if these bifurcations occur, then the variational equations around the homoclinic orbits are integrable in the meaning of differential Galois theory under the assumption that the homoclinic orbits lie on analytic invariant manifolds. We illustrate our theories with an example which arises as stationary states of coupled real Ginzburg-Landau partial differential equations, and demonstrate the theoretical results by numerical ones.

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