We report on the existence of boomerons in a 1-D periodic lattice with no on-site potentials. Following an impact, a spatially localized wave phenomenon forms. This envelope wave packet, with frequency within the propagating band of small-amplitude waves, propagates into the chain, decelerates, and reverses direction without any external forcing. Our results show that this remarkable response requires the nearest-neighbor interactions to have non-convex potential with a branch of negative stiffness. It is suggested that the reversing motion is a consequence of the intriguing interaction between the localized phenomenon and the trail of nonlinear waves behind it.

中文翻译：

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一维晶格中的回旋镖，仅具有最近邻相互作用

我们报告在没有现场电位的一维周期晶格中存在回旋镖。撞击后，形成空间局部波动现象。该包络波包的频率在小振幅波的传播频带内，传播到链中，减速并反转方向，而没有任何外部强迫。我们的结果表明，这种非凡的响应要求最近的邻域相互作用具有负凸势的非凸势。建议反向运动是局部现象与其背后的非线性波迹之间有趣的相互作用的结果。