arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.1622cond-mat.stat-mech
收藏

驱动耗散系统中超扩散引起的大尺度结构

Large-scale structure from superdiffusion in a driven dissipative system

David A. Head, Hajime Tanaka

摘要:

远离平衡的系统具有非常规的多体动力学效应,这可能导致异常的密度涨落和质量输运。有趣的是,这些结构和动力学特征往往同时出现在驱动耗散系统。在这里,我们寻求一个起源,它们共存的二维驱动颗粒气体的数值模拟。我们揭示了超扩散运输和巨大的密度波动之间的因果关系。粒子碰撞时的动力学耗散取决于碰撞粒子的相对速度,并负责粒子的自生大规模持续定向运动,这是结构和运输之间联系的基础。这个场景由一个简单的缩放参数支持。

英文摘要:

A system far from equilibrium is characterized by unconventional many-body dynamical effects, which can lead to anomalous density fluctuations and mass transport. Interestingly, these structural and dynamic features often emerge simultaneously in driven dissipative systems. Here we seek an origin of their co-existence by numerical simulations of a two-dimensional driven granular gas. We reveal a causal link between superdiffusive transport and giant density fluctuations. The kinetic dissipation upon particle collisions depends on the relative velocity of colliding particles, and is responsible for the self-generated large-scale persistent directional motion of particles that underlies the link between structure and transport. This scenario is supported by a simple scaling argument.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑