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UID:0-743@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20200707T150000
DTEND;TZID=Europe/Paris:20200707T160000
DTSTAMP:20200703T151633Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-ricard-alert-zenon/
SUMMARY:Séminaire du LPTMS : Ricard Alert Zenon - Salle des séminaires du
  FAST et du LPTMS\, bâtiment Pascal n°530 - 7 Juil 20 15:00
DESCRIPTION:Topological Defects\, Turbulence\, and Phase Separation\nRicard
  Alert Zenon (Princeton)\n\nZOOM Meeting ID: 929 5958 3836\nPassword: 8135
 01 \n\nActive fluids display striking collective phenomena not possible in
  passive fluids. Examples include spontaneous flows powered by microscopic
  constituents\, and phase separation in the absence of attractive interact
 ions. In this talk\, I will discuss three aspects of the physics of active
  fluids\, connected with experiments in both biological and artificial sof
 t matter systems. First\, I will show that dense colonies of the rod-shape
 d motile bacterium Myxococcus xanthus form active liquid crystals. I will 
 show that topological defects of the cell alignment field induce flows tha
 t lead to the formation of new cell layers\, which triggers the developmen
 t of multicellular structures called fruiting bodies. Second\, I will disc
 uss chaotic flows in active liquid crystals. I will show that\, as in clas
 sic turbulence\, the statistical properties of these active flows at low R
 eynolds number are described by universal scaling laws. Unlike classic tur
 bulence\, however\, this type of active turbulence requires no energy tran
 sfer across scales. Finally\, I will present a new mechanism of liquid-gas
  phase separation in active fluids. I will show that\, in addition to repu
 lsive forces that oppose phase separation\, artificial self-propelled Janu
 s colloids experience torques that reorient particle motion toward high-de
 nsity regions\, providing a novel route to phase separation.
CATEGORIES: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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