活性物质体系中的Casimir效应
Casimir Effect in Active Matter Systems
摘要：
我们数值研究运行和翻滚的活性物质粒子在卡西米尔几何组成的两个有限的平行壁。我们发现，有一个吸引力的大小，增加运行长度的两个墙壁之间。的吸引力表现出一个不寻常的指数依赖于壁分离，它是由于耗尽的游泳者在壁之间的区域的粒子沿壁的运动和几何阴影效应的组合。这种吸引力是强大的，只要壁分离是可比的或小于游泳者的运行长度，并只稍微减少了游泳者之间的空间相互作用。我们还研究了其他的几何形状，并找到制度，其中有一个交叉的墙壁之间的吸引力和排斥力作为一个功能的墙壁分离和运行长度。
英文摘要：
We numerically examine run-and-tumble active matter particles in Casimir geometries composed of two finite parallel walls. We find that there is an attractive force between the two walls of a magnitude that increases with increasing run length. The attraction exhibits an unusual exponential dependence on the wall separation, and it arises due to a depletion of swimmers in the region between the walls by a combination of the motion of the particles along the walls and a geometric shadowing effect. This attraction is robust as long as the wall separation is comparable to or smaller than the swimmer run length, and is only slightly reduced by the inclusion of steric interactions between swimmers. We also examine other geometries and find regimes in which there is a crossover from attraction to repulsion between the walls as a function of wall separation and run length.
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