Instabilities and chaos in a kinetic equation for active nematics

Instabilities and chaos in a kinetic equation for active nematics
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活性向列动力学方程中的不稳定性和混沌

DOI:
10.1088/1367-2630/16/3/035003
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发表时间:
2014-03
影响因子:
3.3
通讯作者:
Chate, Hugues, Ma, Yu-qiang
Chate, Hugues, Ma, Yu-qiang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shi, Xia-qing;Chate, Hugues, Ma, Yu-qiang

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我们在动力学方程水平上研究干活性向列式,强调与著名的热平衡附近非活性棒的Doi理论的差异。通过从动力学方程推导流体动力学方程,我们分析地表明,这两个描述水平共享相同的定性相图,由空间齐次解的线性不稳定性极限定义。特别地,我们证明了有序齐次态在与向列阶的线性起始相邻的区域是不稳定的,并且只有在有序相的更深处是线性稳定的。对动力学方程的直接模拟表明,其解在有序齐次状态的线性不稳定区域是混沌的。讨论了这种大规模混沌的局部机制。
We study dry active nematics at the kinetic equation level, stressing the differences with the well-known Doi theory for non-active rods near thermal equilibrium. By deriving hydrodynamic equations from the kinetic equation, we show analytically that these two description levels share the same qualitative phase diagram, as defined by the linear instability limits of spatially-homogeneous solutions. In particular, we show that the ordered, homogeneous state is unstable in a region bordering the linear onset of nematic order, and is only linearly stable deeper in the ordered phase. Direct simulations of the kinetic equation reveal that its solutions are chaotic in the region of linear instability of the ordered homogeneous state. The local mechanisms for this large-scale chaos are discussed.
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