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arXiv 0912.1706math.APmath-phmath.MP
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非线性Schrödinger/Gross-Pitaevskii方程对称破缺分岔附近的长时间动力学

Long time dynamics near the symmetry breaking bifurcation for nonlinear Schrödinger/Gross-Pitaevskii Equations

Jeremy L. Marzuola, Michael I. Weinstein

摘要:

考虑了一类具有聚焦(吸引)非线性势和对称双阱线性势的非线性Schrödinger / Gross-Pitaevskii方程(NLS/GP). NLS/GP在非线性光学和平均场量子多体现象的建模中起着核心作用。已知存在临界$L^2$范数(光功率/粒子数),在该临界处存在基态的对称性破缺分叉。我们研究了对称性破缺点附近丰富的动力学行为。这种行为的源在全哈密顿偏微分方程是有关的动力学的有限维哈密顿约化。我们推导出这种减少,分析其相空间的一部分,并证明了{ \it阴影定理}的持久性的解决方案,与振荡质量运输井之间,在很长的时间,但有限的,时间尺度内的完整NLS/GP。由于离散和连续/辐射模式的共振耦合,NLS/GP的无限时间动力学预计将脱离有限维降维。

英文摘要:

We consider a class nonlinear Schrödinger / Gross-Pitaevskii equations (NLS/GP) with a focusing (attractive) nonlinear potential and symmetric double well linear potential. NLS/GP plays a central role in the modeling of nonlinear optical and mean-field quantum many-body phenomena. It is known that there is a critical $L^2$ norm (optical power / particle number) at which there is a symmetry breaking bifurcation of the ground state. We study the rich dynamical behavior near the symmetry breaking point. The source of this behavior in the full Hamiltonian PDE is related to the dynamics of a finite-dimensional Hamiltonian reduction. We derive this reduction, analyze a part of its phase space and prove a {\it shadowing theorem} on the persistence of solutions, with oscillating mass-transport between wells, on very long, but finite, time scales within the full NLS/GP. The infinite time dynamics for NLS/GP are expected to depart, from the finite dimensional reduction, due to resonant coupling of discrete and continuum / radiation modes.

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