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Collective stop-and-go dynamics of active bacteria swarms
Svenšek, Daniel ; Pleiner, Harald ; Brand, Helmut R.
We set up a macroscopic model of bacterial growth and transport based on a dynamic preferred direction - the collective velocity of the bacteria. This collective velocity is subject to the ...isotropic-nematic transition modeling the density-controlled transformation between immotile and motile bacterial states. The choice of the dynamic preferred direction introduces a distinctive coupling of orientational ordering and transport not encountered otherwise. The approach can also be applied to other systems spontaneously switching between individual (disordered) and collective (ordered) behavior and/or collectively responding to density variations, e.g., bird flocks, fish schools, etc. We observe a characteristic and robust stop-and-go behavior. The inclusion of chirality results in a complex pulsating dynamics.
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