Active nonreciprocal attraction between motile particles in an elastic medium.

  title={Active nonreciprocal attraction between motile particles in an elastic medium.},
  author={Rahul K Gupta and Raushan Kant and Harsh Soni and A. K. Sood and Sriram Ramaswamy},
  journal={Physical review. E},
  volume={105 6-1},
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… 

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