论文标题
在弹性介质中，活动颗粒之间的活跃非偏置吸引力
Active nonreciprocal attraction between motile particles in an elastic medium
论文作者
论文摘要
我们从对振动激活的粒状物质的实验和模拟中表明，在基材转弯的弹性介质中自构成的极性杆并彼此相互移动。我们通过对运动点粒子的粗粒理论来解释这种有效的吸引力，作为移动点强度密度，在重新定位其他颗粒的介质中会产生弹性菌株。我们的测量值定性地证实了杆造成的扭曲的预测特征，包括落后位移场的$ | x |^{ - 1/2} $尾巴。沿着沿着运动方向的位移大小之间的差异仍然存在。我们的理论应该与细胞外基质中的运动细胞的相互作用或受支持的凝胶或组织层相关。
We show from experiments and simulations on vibration-activated granular matter that self-propelled polar rods in an elastic medium on a substrate turn and move towards each other. We account for this effective attraction through a coarse-grained theory of a motile particle as a moving point-force density that creates elastic strains in the medium that reorient other particles. Our measurements confirm qualitatively the predicted features of the distortions created by the rods, including the $|x|^{-1/2}$ tail of the trailing displacement field and non-reciprocal sensing and pursuit. A discrepancy between the magnitudes of displacements along and transverse to the direction of motion remains. Our theory should be of relevance to the interaction of motile cells in the extracellular matrix or in a supported layer of gel or tissue.
