Silent Flocks: Constraints on Signal Propagation Across Biological Groups

Autores
Cavagna, Andrea; Giardina, Irene; Grigera, Tomas Sebastian; Jelic, Asja; Levine, Dov; Ramaswamy, Sriram; Viale, Massimiliano
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Experiments find coherent information transfer through biological groups on length and time scales distinctly below those on which asymptotically correct hydrodynamic theories apply. We present here a new continuum theory of collective motion coupling the velocity and density fields of Toner and Tu to the inertial spin field recently introduced to describe information propagation in natural flocks of birds. The long-wavelength limit of the new equations reproduces the Toner-Tu theory, while at shorter wavelengths (or, equivalently, smaller damping), spin fluctuations dominate over density fluctuations, and second-sound propagation of the kind observed in real flocks emerges. We study the dispersion relation of the new theory and find that when the speed of second sound is large, a gap in momentum space sharply separates firstfrom second-sound modes. This gap implies the existence of silent flocks, namely, of medium-sized systems across which information cannot propagate in a linear and underdamped way, either under the form of orientational fluctuations or under that of density fluctuations, making it hard for the group to achieve coordination.
Fil: Cavagna, Andrea. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia. The Graduate Center; Estados Unidos
Fil: Giardina, Irene. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia. The Graduate Center; Estados Unidos
Fil: Grigera, Tomas Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Jelic, Asja. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia
Fil: Levine, Dov. The Graduate Center; Estados Unidos. Technion-IIT; Israel
Fil: Ramaswamy, Sriram. Osman Sagar Road; India
Fil: Viale, Massimiliano. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia
Materia
FLOCKING
ACTIVE MATTER
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/48173
Acceder
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spelling Silent Flocks: Constraints on Signal Propagation Across Biological GroupsCavagna, AndreaGiardina, IreneGrigera, Tomas SebastianJelic, AsjaLevine, DovRamaswamy, SriramViale, MassimilianoFLOCKINGACTIVE MATTERhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1https://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Experiments find coherent information transfer through biological groups on length and time scales distinctly below those on which asymptotically correct hydrodynamic theories apply. We present here a new continuum theory of collective motion coupling the velocity and density fields of Toner and Tu to the inertial spin field recently introduced to describe information propagation in natural flocks of birds. The long-wavelength limit of the new equations reproduces the Toner-Tu theory, while at shorter wavelengths (or, equivalently, smaller damping), spin fluctuations dominate over density fluctuations, and second-sound propagation of the kind observed in real flocks emerges. We study the dispersion relation of the new theory and find that when the speed of second sound is large, a gap in momentum space sharply separates firstfrom second-sound modes. This gap implies the existence of silent flocks, namely, of medium-sized systems across which information cannot propagate in a linear and underdamped way, either under the form of orientational fluctuations or under that of density fluctuations, making it hard for the group to achieve coordination.Fil: Cavagna, Andrea. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia. The Graduate Center; Estados UnidosFil: Giardina, Irene. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia. The Graduate Center; Estados UnidosFil: Grigera, Tomas Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Jelic, Asja. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; ItaliaFil: Levine, Dov. The Graduate Center; Estados Unidos. Technion-IIT; IsraelFil: Ramaswamy, Sriram. Osman Sagar Road; IndiaFil: Viale, Massimiliano. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; ItaliaAmerican Physical Society2015-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/48173Cavagna, Andrea; Giardina, Irene; Grigera, Tomas Sebastian; Jelic, Asja; Levine, Dov; et al.; Silent Flocks: Constraints on Signal Propagation Across Biological Groups; American Physical Society; Physical Review Letters; 114; 21; 5-2015; 2181010031-9007CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.114.218101info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.218101info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:39:15Zoai:ri.conicet.gov.ar:11336/48173instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:39:15.886CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Silent Flocks: Constraints on Signal Propagation Across Biological Groups
title Silent Flocks: Constraints on Signal Propagation Across Biological Groups
spellingShingle Silent Flocks: Constraints on Signal Propagation Across Biological Groups
Cavagna, Andrea
FLOCKING
ACTIVE MATTER
title_short Silent Flocks: Constraints on Signal Propagation Across Biological Groups
title_full Silent Flocks: Constraints on Signal Propagation Across Biological Groups
title_fullStr Silent Flocks: Constraints on Signal Propagation Across Biological Groups
title_full_unstemmed Silent Flocks: Constraints on Signal Propagation Across Biological Groups
title_sort Silent Flocks: Constraints on Signal Propagation Across Biological Groups
dc.creator.none.fl_str_mv Cavagna, Andrea
Giardina, Irene
Grigera, Tomas Sebastian
Jelic, Asja
Levine, Dov
Ramaswamy, Sriram
Viale, Massimiliano
author Cavagna, Andrea
author_facet Cavagna, Andrea
Giardina, Irene
Grigera, Tomas Sebastian
Jelic, Asja
Levine, Dov
Ramaswamy, Sriram
Viale, Massimiliano
author_role author
author2 Giardina, Irene
Grigera, Tomas Sebastian
Jelic, Asja
Levine, Dov
Ramaswamy, Sriram
Viale, Massimiliano
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv FLOCKING
ACTIVE MATTER
topic FLOCKING
ACTIVE MATTER
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Experiments find coherent information transfer through biological groups on length and time scales distinctly below those on which asymptotically correct hydrodynamic theories apply. We present here a new continuum theory of collective motion coupling the velocity and density fields of Toner and Tu to the inertial spin field recently introduced to describe information propagation in natural flocks of birds. The long-wavelength limit of the new equations reproduces the Toner-Tu theory, while at shorter wavelengths (or, equivalently, smaller damping), spin fluctuations dominate over density fluctuations, and second-sound propagation of the kind observed in real flocks emerges. We study the dispersion relation of the new theory and find that when the speed of second sound is large, a gap in momentum space sharply separates firstfrom second-sound modes. This gap implies the existence of silent flocks, namely, of medium-sized systems across which information cannot propagate in a linear and underdamped way, either under the form of orientational fluctuations or under that of density fluctuations, making it hard for the group to achieve coordination.
Fil: Cavagna, Andrea. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia. The Graduate Center; Estados Unidos
Fil: Giardina, Irene. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia. The Graduate Center; Estados Unidos
Fil: Grigera, Tomas Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
Fil: Jelic, Asja. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia
Fil: Levine, Dov. The Graduate Center; Estados Unidos. Technion-IIT; Israel
Fil: Ramaswamy, Sriram. Osman Sagar Road; India
Fil: Viale, Massimiliano. Istituto Sistemi Complessi; Italia. Università degli studi di Roma "La Sapienza"; Italia
description Experiments find coherent information transfer through biological groups on length and time scales distinctly below those on which asymptotically correct hydrodynamic theories apply. We present here a new continuum theory of collective motion coupling the velocity and density fields of Toner and Tu to the inertial spin field recently introduced to describe information propagation in natural flocks of birds. The long-wavelength limit of the new equations reproduces the Toner-Tu theory, while at shorter wavelengths (or, equivalently, smaller damping), spin fluctuations dominate over density fluctuations, and second-sound propagation of the kind observed in real flocks emerges. We study the dispersion relation of the new theory and find that when the speed of second sound is large, a gap in momentum space sharply separates firstfrom second-sound modes. This gap implies the existence of silent flocks, namely, of medium-sized systems across which information cannot propagate in a linear and underdamped way, either under the form of orientational fluctuations or under that of density fluctuations, making it hard for the group to achieve coordination.
publishDate 2015
dc.date.none.fl_str_mv 2015-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/48173
Cavagna, Andrea; Giardina, Irene; Grigera, Tomas Sebastian; Jelic, Asja; Levine, Dov; et al.; Silent Flocks: Constraints on Signal Propagation Across Biological Groups; American Physical Society; Physical Review Letters; 114; 21; 5-2015; 218101
0031-9007
CONICET Digital
CONICET
url http://hdl.handle.net/11336/48173
identifier_str_mv Cavagna, Andrea; Giardina, Irene; Grigera, Tomas Sebastian; Jelic, Asja; Levine, Dov; et al.; Silent Flocks: Constraints on Signal Propagation Across Biological Groups; American Physical Society; Physical Review Letters; 114; 21; 5-2015; 218101
0031-9007
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.114.218101
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.218101
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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