涌现活动为声学捕获球体对的混沌路径提供动力
Emergent activity powers a path to chaos for pairs of acoustically trapped spheres
浏览论文内容
中文总结 AI 辅助
该研究揭示声学捕获球体对通过非互易波散射产生涌现活动，经超临界霍普夫分岔进入准周期和混沌，实验与模拟共同验证了从被动到混沌的完整路径。
中文摘要 AI 辅助
共享声学陷阱的球体对有时会间歇性地旋转，尽管它们没有自推进、没有明显的动力来源，也没有对称性破缺机制，在单条轨迹中会在摇摆和旋转之间切换。非互易波散射为这种涌现活动提供动力，而阻力通过将旋转与平移耦合来塑造其动力学。不匹配的球体对可以经历超临界霍普夫分岔进入准周期环面，在该环面上球体对的轨道会定期反转，并且远离平衡时，进入确定性混沌。实验验证了这一机制并展示了其定性特征；模拟揭示了从被动到混沌的完整无噪声路径，并提示了类似动力学如何在其他活性物质系统中涌现。
英文摘要
Pairs of spheres sharing an acoustic trap sometimes spin intermittently despite having no self-propulsion, no obvious power source, and no symmetry-breaking mechanism, switching between rocking and spinning within a single trajectory. Nonreciprocal wave scattering powers this emergent activity, and drag shapes their dynamics by coupling rotations to translations. Mismatched pairs can pass through a supercritical Hopf bifurcation into a quasiperiodic torus on which the pair's orbit reverses regularly and, farther from equilibrium, into deterministic chaos. Experiments motivate this mechanism and share its qualitative signatures; simulations reveal a full noise-free route from passivity to chaos, and suggest how analogous dynamics can emerge in other active-matter systems.
发表机构
- Northwestern University（西北大学）
- New York University（纽约大学）
机构由 AI 辅助整理，请以论文原文为准。
