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SUMMARY:The force-force correlator for disordered elastic systems - Cathel
 ijne ter Burg\, DAMTP
DTSTART:20221018T120000Z
DTEND:20221018T130000Z
UID:TALK178874@talks.cam.ac.uk
CONTACT:Camille Scalliet
DESCRIPTION:Elastic interfaces driven in a disordered medium exhibit a phe
 nomenon called avalanches: periods of rapid movement in between states whe
 re the interface is pinned.  Today it is understood that the minimal ingre
 dients to describe these systems are an elastic energy competing with the 
 disorder energy\, and a confining potential. When the center $w$ of this c
 onfining potential is slowly increased\, one reaches the zero-temperature 
 depinning transition\, where physics becomes universal.  One can measure c
 orrelations of the interface's center-of-mass position as a function of $w
 $\, which depends on the driving velocity. Its zero-velocity limit\, $Delt
 a(w)$\, is the principle observable in the field-theory approach to disord
 ered systems.\n\nIn this talk\, I will first give an overview of the theor
 y of disordered systems and the important concepts from its field theory. 
 I will then discuss the field theory force-force correlator $\\Delta(w)$\,
  how it can be measured in experiment and what can be learned from it.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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