Asymmetric exchange in flocks

  title={Asymmetric exchange in flocks},
  author={Lokrshi Prawar Dadhichi and Rahul Chajwa and Ananyo Maitra and Sriram Ramaswamy},
As the constituents of a flock are polar, one expects a fore-aft asymmetry in their interactions. We show here that the resulting antisymmetric part of the “exchange coupling” between a bird and its neighbours, if large enough, destabilizes the flock through spontaneous turning of the birds. The same asymmetry also yields a natural mechanism for a difference between the speed of advection of information along the flock and the speed of the flock itself. We show that the absence of detailed… 
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