A regularized model equation for discrete breathers in anharmonic lattices with symmetric nearest-neighbor potentials

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• 作者：Bao-Feng Feng ; Yusuke Doi and Takuji Kawahara
• 关键词：Regularized continuum model ; Padé ; approximation ; Fermi– ; Pasta– ; Ulam lattice ; Discrete breather ; Intrinsic localized mode ; Movability ; Multiple scales method ; Breather– ; breather collision
• 刊名：Physica D
• 出版年：2006
• 出版时间：1 February 2006
• 年：2006
• 卷：214
• 期：1
• 页码：33-41
• 全文大小：1612 K

文摘

We propose a regularized continuum model equation for describing discrete breathers or intrinsic localized modes in one-dimensional anharmonic lattices with symmetric nearest-neighbor potentials. Exact stationary breather solutions with purely hard quartic anharmonicity, as well as approximate stationary breather solutions in the general case, are found. The application of the multiple scales analysis indicates the movability of the small-amplitude breather solutions. The results of numerical simulations for the model equation fully support the analytical solutions. As regards the breather–breather collisions, the continuum model shares many common features with its discrete counterpart, which provides an opportunity to clarify the energy exchange mechanism for collisions between discrete breathers in lattices.