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SUMMARY:Collective motion and its fragility - Alexandre Solon (U Sorbonne)
DTSTART:20230530T120000Z
DTEND:20230530T130000Z
UID:TALK199948@talks.cam.ac.uk
CONTACT:Sarah Loos
DESCRIPTION:Understanding the collective motion of self-propelling particl
 es\, such as flocking birds\, is a problem that is almost 30 years old but
  remains topical.  Considering minimal flocking models (the Vicsek model a
 nd its variants) I will present several results that tend to show the frag
 ility of the polar ordered phases of collective motion. First\, any amount
  of spatial anisotropy destroys the long-range correlations and giant dens
 ity fluctuations of these states. Then\, the ordered state of the "Malthus
 ian" model\, with population dynamics\, is unstable to the nucleation of t
 opological defect as well as the ordered state in the Active Ising model t
 hat has discrete symmetry.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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