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UID:0-757@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20210126T110000
DTEND;TZID=Europe/Paris:20210126T120000
DTSTAMP:20210114T090533Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-matthieu-mangeat-saarland-university/
SUMMARY:Séminaire du LPTMS : Matthieu Mangeat (Saarland University) - LPTM
 S (100% online seminar) - 26 Jan 21 11:00
DESCRIPTION:Flocking and reorientation transition in the q-state active Pot
 ts model\nMatthieu Mangeat (Saarland University)\n\nOnline seminar --- Zoo
 m Meeting ID: 947 5714 7410 -- Passcode: Ask L. Mazza or D. Petrov --\n\n\
 nWe study the q-state active Potts model (APM) on a two-dimensional lattic
 e in which active particles have q internal states corresponding to the q 
 directions of motion. A local alignment rule inspired by the ferromagnetic
  q-state Potts model and self-propulsion via biased diffusion according to
  the internal particle states leads to a collective motion at high densiti
 es and low noise. We formulate a coarse-grained hydrodynamic theory with w
 hich we compute the phase diagram of the APM and explore the flocking dyna
 mics in the region\, in which the high-density (polar liquid) phase coexis
 ts with the low-density (gas) phase and forms a fluctuating band of cohere
 ntly moving particles. As a function of the particle self-propulsion veloc
 ity\, a novel reorientation transition of the phase-separated profiles fro
 m transversal to longitudinal band motion is found\, which is absent in th
 e Vicsek model [1] and the active Ising model [2]. The origin of this reor
 ientation transition is revealed by a stability analysis : for large veloc
 ities the transverse diffusion constant approaches zero and then stabilize
 s longitudinal band motion. Computer simulations corroborate the analytica
 l predictions of the flocking and reorientation\ntransitions and validate 
 the phase diagrams of the APM [3].\n\n[1] T. Vicsek\, A. Czirok\, E. Ben-J
 acob\, I. Cohen\, and O. Shochet\, Phys. Rev. Lett. 75\, 1226 (1995).\n[2]
  A. P. Solon and J. Tailleur\, Phys. Rev. Lett. 111\, 078101 (2013) \; Phy
 s. Rev. E 92\, 042119 (2015).\n[3] S. Chatterjee\, M. Mangeat\, R. Paul\, 
 and H. Rieger\, EPL 130\, 66001 (2020) \; M. Mangeat\, S. Chatterjee\, R. 
 Paul\, and H. Rieger\, Phys. Rev. E 102\, 042601 (2020).\n\n\n\n\n
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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