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SUMMARY:Absorbing phase transitions in systems with mediated interactions:
  a mean-field viewpoint - Cesare Nardini\, CEA - Paris Saclay
DTSTART:20220524T120000Z
DTEND:20220524T130000Z
UID:TALK172109@talks.cam.ac.uk
CONTACT:Tal Agranov
DESCRIPTION:Experiments of periodically sheared colloidal suspensions or s
 oft amorphous solids display a transition from reversible to irreversible 
 particle motion that\, when analysed stroboscopically in time\, is interpr
 eted as an absorbing phase transition with infinitely many absorbing state
 s. This was widely considered to belong to the Conserved Directed Percolat
 ion (CDP) universality class\, at which the system displays very weak dens
 ity fluctuations (hyper-uniformity). \n\nIn these systems\, however\, inte
 ractions mediated by hydrodynamics or elasticity are present\, causing pas
 sive regions to be affected by active ones. I will introduce and discuss a
  minimal model for for the stroboscopic dynamics of sheared soft materials
 \, designed to include the effect of mediated interactions. I will show th
 at they induce a new universality class\, distinct from CDP. These results
  are obtained by a combination of numerical simulations and by a mean-fiel
 d analysis that allows to derive the field theoretical description of the 
 absorbing phase transition.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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