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Collective motion of run-and-tumble particles drives aggregation in one-dimensional systems | | Christian Vanhille Campos
; Francisco Alarcón Oseguera
; Ignacio Pagonabarraga
; Ricardo Brito
; Chantal Valeriani
; | | Date: |
Tue, 3 Dec 2019 10:28:29 GMT (1859kb,D) | | Abstract: | We numerically study a one-dimensional system of self-propelled particles on
a lattice where the state of each particle is given by its moving direction
(left or right) and its position on the lattice. Particles obey run-and-tumble
dynamics and interact with each other via excluded volume. Besides particle
motion, we consider the collective motion of aggregates towards the direction
dictated by the majority of their constituents (in a momentum-conservation
manner). Our results show that this non-equilibrium system reaches a stationary
regime with very distinct states of aggregation that depend on the tumbling
rate and the density. We demonstrate that these states are characterized by the
existence of moving clusters of jammed particles separated by a gas of
free-moving particles in constant dynamical exchange. Thus, we prove that each
state of aggregation presents very different cluster size distribution and
site-to-site occupancy correlation functions appearing to evolve continuously
from one state to the other as the tumbling rate and the density vary. We
believe our results to be of key relevance to understand that no alignment
interactions or attractive forces are needed for self-organization, aggregation
and collective motion to emerge in a suspension of active particles. | | Source: | arXiv, 1912.1282 | | Services: | Forum | Review | PDF | Favorites | |
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