Detalle Publicación


Spontaneous emergence of counterclockwise vortex motion in assemblies of pedestrians roaming within an enclosure

Título de la revista: SCIENTIFIC REPORTS
ISSN: 2045-2322
Volumen: 12
Número: 1
Páginas: 2647
Fecha de publicación: 2022
The emergence of coherent vortices has been observed in a wide variety of many-body systems such as animal flocks, bacteria, colloids, vibrated granular materials or human crowds. Here, we experimentally demonstrate that pedestrians roaming within an enclosure also form vortex-like patterns which, intriguingly, only rotate counterclockwise. By implementing simple numerical simulations, we evidence that the development of swirls in many-particle systems can be described as a phase transition in which both the density of agents and their dissipative interactions with the boundaries play a determinant role. Also, for the specific case of pedestrians, we show that the preference of right-handed people (the majority in our experiments) to turn leftwards when facing a wall is the symmetry breaking mechanism needed to trigger the global counterclockwise rotation observed.