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SUMMARY:Fragility and metastability of polar flocks - Hugues Chaté (CEA/S
 aclay)
DTSTART:20230703T133000Z
DTEND:20230703T140000Z
UID:TALK201091@talks.cam.ac.uk
DESCRIPTION:Polar flocks\, understood in the Vicsek/Toner-Tu sense of the 
 collective flow of self-propelled particles aligning their velocities\, re
 main central in active matter studies. They are a limit case of real situa
 tions: the fluid surrounding particles is ignored (&ldquo\;dry&rdquo\;)\, 
 the particles are pointlike (&ldquo\;dilute&rdquo\;)\, so that alignment i
 s the only interaction. Even though their relevance in the real world is l
 imited (but not nil)\, they must be studied thoroughly since understanding
  them is crucial to approach more complicated and realistic systems.\nOne 
 key property of polar flocks is that they show true long-range (polar) ori
 entational order even in 2D. Recently\, evidence started accumulating that
  this ordered phase is both fragile and metastable. This talk will be most
 ly devoted to reviewing these findings and discussing their implications.
LOCATION:Seminar Room 1\, Newton Institute
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