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CATEGORIES:DAMTP Statistical Physics and Soft Matter Seminar
SUMMARY:Absorbing phase transitions in systems with mediat
 ed interactions: a mean-field viewpoint - Cesare N
 ardini\, CEA - Paris Saclay
DTSTART;TZID=Europe/London:20220524T130000
DTEND;TZID=Europe/London:20220524T140000
UID:TALK172109AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/172109
DESCRIPTION:Experiments of periodically sheared colloidal susp
 ensions or soft amorphous solids display a transit
 ion from reversible to irreversible particle motio
 n that\, when analysed stroboscopically in time\, 
 is interpreted as an absorbing phase transition wi
 th infinitely many absorbing states. This was wide
 ly considered to belong to the Conserved Directed 
 Percolation (CDP) universality class\, at which th
 e system displays very weak density fluctuations (
 hyper-uniformity). \n\nIn these systems\, however\
 , interactions mediated by hydrodynamics or elasti
 city are present\, causing passive regions to be a
 ffected by active ones. I will introduce and discu
 ss a minimal model for for the stroboscopic dynami
 cs of sheared soft materials\, designed to include
  the effect of mediated interactions. I will show 
 that they induce a new universality class\, distin
 ct from CDP. These results are obtained by a combi
 nation of numerical simulations and by a mean-fiel
 d analysis that allows to derive the field theoret
 ical description of the absorbing phase transition
 .
LOCATION:Center for Mathematical Sciences\, Lecture room MR
 4
CONTACT:Tal Agranov
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