Dynamic scaling in natural swarms

Collective behaviour in biological systems presents theoretical challenges beyond the borders of classical statistical physics. The lack of concepts such as scaling and renormalization is particularly problematic, as it forces us to negotiate details whose relevance is often hard to assess. In an at...

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Autores principales: Cavagna, Andrea, Conti, Daniele, Creato, Chiara, Del Castello, Lorenzo, Giardina, Irene, Grigera, Tomás Sebastián, Melillo, Stefania, Parisi, Leonardo, Viale, Massimiliano
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Física
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124265
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124265
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
spellingShingle Física
Cavagna, Andrea
Conti, Daniele
Creato, Chiara
Del Castello, Lorenzo
Giardina, Irene
Grigera, Tomás Sebastián
Melillo, Stefania
Parisi, Leonardo
Viale, Massimiliano
Dynamic scaling in natural swarms
topic_facet Física
description Collective behaviour in biological systems presents theoretical challenges beyond the borders of classical statistical physics. The lack of concepts such as scaling and renormalization is particularly problematic, as it forces us to negotiate details whose relevance is often hard to assess. In an attempt to improve this situation, we present here experimental evidence of the emergence of dynamic scaling laws in natural swarms of midges. We find that spatio-temporal correlation functions in different swarms can be rescaled by using a single characteristic time, which grows with the correlation length with a dynamical critical exponent z ≈ 1, a value not found in any other standard statistical model. To check whether out-of-equilibrium effects may be responsible for this anomalous exponent, we run simulations of the simplest model of self-propelled particles and find z ≈ 2, suggesting that natural swarms belong to a novel dynamic universality class. This conclusion is strengthened by experimental evidence of the presence of non-dissipative modes in the relaxation, indicating that previously overlooked inertial effects are needed to describe swarm dynamics. The absence of a purely dissipative regime suggests that natural swarms undergo a near-critical censorship of hydrodynamics. Swarms and statistical physics seem like natural bedfellows, but concepts like scaling are yet to prove directly applicable to insect group dynamics. A study of midges suggests they are, and that they may give rise to a new universality class.
format Articulo
Articulo
author Cavagna, Andrea
Conti, Daniele
Creato, Chiara
Del Castello, Lorenzo
Giardina, Irene
Grigera, Tomás Sebastián
Melillo, Stefania
Parisi, Leonardo
Viale, Massimiliano
author_facet Cavagna, Andrea
Conti, Daniele
Creato, Chiara
Del Castello, Lorenzo
Giardina, Irene
Grigera, Tomás Sebastián
Melillo, Stefania
Parisi, Leonardo
Viale, Massimiliano
author_sort Cavagna, Andrea
title Dynamic scaling in natural swarms
title_short Dynamic scaling in natural swarms
title_full Dynamic scaling in natural swarms
title_fullStr Dynamic scaling in natural swarms
title_full_unstemmed Dynamic scaling in natural swarms
title_sort dynamic scaling in natural swarms
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/124265
work_keys_str_mv AT cavagnaandrea dynamicscalinginnaturalswarms
AT contidaniele dynamicscalinginnaturalswarms
AT creatochiara dynamicscalinginnaturalswarms
AT delcastellolorenzo dynamicscalinginnaturalswarms
AT giardinairene dynamicscalinginnaturalswarms
AT grigeratomassebastian dynamicscalinginnaturalswarms
AT melillostefania dynamicscalinginnaturalswarms
AT parisileonardo dynamicscalinginnaturalswarms
AT vialemassimiliano dynamicscalinginnaturalswarms
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