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UID:0-1163@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20261218T110000
DTEND;TZID=Europe/Paris:20261218T120000
DTSTAMP:20261103T101357Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/physics-biology-i
 nterface-seminar-abhijeet-melkani/
SUMMARY:Physics-Biology interface seminar - Salle des séminaires du FAST e
 t du LPTMS\, bâtiment Pascal n°530 - 18 Déc 26 11:00
DESCRIPTION:Shape fluctuations reveal the hydrodynamics of wild fish school
 s\nAbhijeet Melkani (ENS Lyon)\nThe shape of an animal group\, such as a s
 chool of fish or a herd of buffalos\, continuously fluctuates even in the 
 absence of external perturbations. Although these shape fluctuations are a
 mong the most accessible observables of large living collectives\, the phy
 sical principles governing them remain unknown.\n\nUsing aerial recordings
  of wild fish\, we show that the fluctuating boundaries of milling schools
  exhibit power-law spectra and propagating shape waves. These scaling laws
  are shared across three species\, contrasting ecosystems\, and multiple y
 ears. By simulating and coarse-graining a minimal agent-based model\, we i
 dentify milling schools as droplets of polar active fluids and derive a bo
 undary law analogous to Laplace's law in passive fluids.\n\nThe resulting 
 hydrodynamic theory\, which models an animal group as a droplet of active 
 matter\, accounts for all our measurements. Our results establish shape fl
 uctuations as a quantitative probe of the physical laws governing collecti
 ve animal motion\, while opening new avenues for understanding how animal 
 groups respond to their environment and interact with other groups and pre
 dators.\n\nFigure1_closeup_compressed
CATEGORIES:physbio,seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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TZID:Europe/Paris
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DTSTART:20261025T020000
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TZOFFSETTO:+0100
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