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SUMMARY:Moving through disorder: collective trapping\, collective escaping
  and sub-diffusion - Fernando Peruani (CY Cergy Paris University)
DTSTART:20230803T120000Z
DTEND:20230803T124500Z
UID:TALK203626@talks.cam.ac.uk
DESCRIPTION:Most examples of collections of moving biological entities -- 
 from cells\, to insects and vertebrates -- take place in heterogeneous\, d
 isodered\, environments.&nbsp\;Despite of this\, most experimental and the
 oretical efforts have focused on the transport properties in homogeneous m
 edia. The impact of environmental heterogeneities has remained poorly expl
 ored. Here\, we will see that the transport properties in heterogeneous me
 dia is fundamentally different from the one in homogenous environments. Fo
 r instance\, in heterogeneous environments\, spontaneous particle trapping
  of particles and sub-diffusion can occur\, while long-range order of two-
 dimensional polar active liquids is not possible. Furthermore\, in the abs
 ence of dynamic noise\, it is possible to show that when the equations of 
 motion exhibit a Hamiltonian structure\, particle trapping cannot occur\, 
 while the presence of attractors in these equations indicate the asymptoti
 c convergence of particle trajectories to bounded areas in space\, i.e. tr
 aps.\nReferences:\n\nPattanayak\, Aranson\, Peruani\, in preparation (2023
 )\nRahmani\, Peruani\, Romanczuk\, Commun Phys 4\, 206 (2021)\nPeruani and
  Aranson\, Phys. Rev. Lett. 120\, 238101 (2018)\nChepizhko and Fernando Pe
 ruani\, Phys. Rev. Lett. 111\, 160604 (2013)\nChepizhko\, E.G. Altmann\, a
 nd F. Peruani\, Phys. Rev. Lett. 110\, 238101 (2013)\n\n&nbsp\;
LOCATION:Seminar Room 2\, Newton Institute
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