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UID:0-767@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20210504T110000
DTEND;TZID=Europe/Paris:20210504T120000
DTSTAMP:20210422T075133Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-giulia-pisegna/
SUMMARY:Séminaire du LPTMS :  Giulia Pisegna (University of Rome La Sapien
 za) - LPTMS (100% online seminar) - 4 Mai 21 11:00
DESCRIPTION:Dynamical Renormalization Group Approach to the Collective Beha
 vior of Swarms\nGiulia Pisegna (University of Rome La Sapienza)\n\nOnline 
 seminar --- Zoom Meeting ID: 951 4623 4806 -- Passcode: ask L. Mazza and D
 . Petrov --\n\nWe study the critical behavior of a model with nondissipati
 ve couplings aimed at describing the collective behavior of natural swarms
 \, using the dynamical renormalization group under a fixed-network approxi
 mation. At one loop\, we find a crossover between an unstable fixed point\
 , characterized by a dynamical critical exponent z=d/2\, and a stable fixe
 d point with z=2\, a result we confirm through numerical simulations. The 
 crossover is regulated by a length scale given by the ratio between the tr
 ansport coefficient and the effective friction\, so that in finite-size bi
 ological systems with low dissipation\, dynamics is ruled by the unstable 
 fixed point. In three dimensions this mechanism gives z=3/2\, a value sign
 ificantly closer to the experimental window\, 1.0≤z≤1.3\, than the val
 ue z≈2 numerically found in fully dissipative models\, either at or off 
 equilibrium. This result indicates that nondissipative dynamical couplings
  are necessary to develop a theory of natural swarms fully consistent with
  experiments.
CATEGORIES:seminars
LOCATION:LPTMS (100% online seminar)\, LPTMS - Bâtiment Pascal n° 530 rue
  André Rivière - Université Paris-Saclay\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=LPTMS - Bâtiment Pascal n
 ° 530 rue André Rivière - Université Paris-Saclay\, Orsay\, 91405\, Fr
 ance;X-APPLE-RADIUS=100;X-TITLE=LPTMS (100% online seminar):geo:0,0
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DTSTART:20210328T030000
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