Asymmetric exchange in flocks

@inproceedings{Dadhichi2016AsymmetricEI,
  title={Asymmetric exchange in flocks},
  author={Lokrshi Prawar Dadhichi and Rahul Chajwa and Ananyo Maitra and Sriram Ramaswamy},
  year={2016}
}
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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Figures from this paper

Phases and excitations of active rod-bead mixtures: simulations and experiments.

The direction-dependent sound speeds and the scaling of fluctuations are consistent with the predictions of field theories of flocking; sound damping rates show departures from such theories, but the range of wavenumbers explored is modest.

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