Abstract
We study collective dynamics of interacting deformable self-propelled particles whose migration velocity increases when the local density of particles is increased. Numerical simulations in two dimensions reveal that traveling bands similar to those found previously in the Vicsek-type model is easily formed by this local density dependence of the migration velocity. We show that a pair of stripe bands which are traveling to the opposite directions is not destructed by a head-on collision but survives again after collision.
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