A universal separatrix map for weak interactions of solitary waves in generalized nonlinear Schrödinger equations |
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Authors: | Yi Zhu Richard Haberman Jianke Yang |
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Institution: | aZhou Pei-Yuan Center for Applied Mathematics, Tsinghua University, Beijing 100084, China;bDepartment of Mathematics, Southern Methodist University, Dallas, TX 75275, USA;cDepartment of Mathematics and Statistics, University of Vermont, Burlington, VT 05401, USA |
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Abstract: | It is known that weak interactions of two solitary waves in generalized nonlinear Schrödinger (NLS) equations exhibit fractal dependence on initial conditions, and the dynamics of these interactions is governed by a universal two-degree-of-freedom ODE system Y. Zhu J. Yang, Universal fractal structures in the weak interaction of solitary waves in generalized nonlinear Schrödinger equations, Phys. Rev. E 75 (2007) 036605]. In this paper, this ODE system is analyzed comprehensively. Using asymptotic methods along separatrix orbits, a simple second-order map is derived. This map does not have any free parameters after variable rescalings, and thus is universal for all weak interactions of solitary waves in generalized NLS equations. Comparison between this map’s predictions and direct simulations of the ODE system shows that the map can capture the fractal-scattering phenomenon of the ODE system very well both qualitatively and quantitatively. |
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Keywords: | Weak interactions Solitary waves Fractal scattering Separatrix map |
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