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arXiv 1407.8516cond-mat.soft
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球面上的活动群

Active swarms on a sphere

Rastko Sknepnek, Silke Henkes

摘要:

在这里,我们表明,耦合曲率有深远的影响,集体运动在积极的系统,导致模式没有观察到在平坦的空间。弯曲环境中这种主动运动的生物学例子很多:弯曲和组织折叠在原肠胚形成期间至关重要,上皮细胞和内皮细胞不断生长,肠道中的弯曲隐窝和绒毛,以及哺乳动物角膜上皮以稳态涡旋模式生长。在物理学方面,涂有主动驱动的微管束的液滴显示出主动的微扰模式。本文研究了球上具有极性排列的自推进粒子模型。这些运动模式的标志是一个极涡和一个循环带,这是由于球形拓扑和匀速运动之间的不相容性而产生的--这是毛球定理的一个结果。我们目前的分析结果表明,挫折由于曲率导致稳定的弹性变形存储能量的带。

英文摘要:

Here we show that coupling to curvature has profound effects on collective motion in active systems, leading to patterns not observed in flat space. Biological examples of such active motion in curved environments are numerous: curvature and tissue folding are crucial during gastrulation, epithelial and endothelial cells move on constantly growing, curved crypts and vili in the gut, and the mammalian corneal epithelium grows in a steady-state vortex pattern. On the physics side, droplets coated with actively driven microtubule bundles show active nematic patterns. We study a model of self-propelled particles with polar alignment on a sphere. Hallmarks of these motion patterns are a polar vortex and a circulating band arising due to the incompatibility between spherical topology and uniform motion - a consequence of the hairy ball theorem. We present analytical results showing that frustration due to curvature leads to stable elastic distortions storing energy in the band.

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。

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