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SUMMARY: A direct link between active matter and sheared granular systems 
 - M. Lisa Manning (Syracuse University)
DTSTART:20201013T120000Z
DTEND:20201013T130000Z
UID:TALK152524@talks.cam.ac.uk
CONTACT:Patrick Pietzonka
DESCRIPTION:Zoom link: https://maths-cam-ac-uk.zoom.us/j/94018037756\n\nTh
 e similarity in mechanical properties of dense active matter and sheared a
 morphous solids has been noted in recent years without a rigorous examinat
 ion of the underlying mechanism. We develop a mean-field model that predic
 ts that their critical behavior should be equivalent in infinite dimension
 s\, up to a rescaling factor that depends on the correlation length of the
  applied field. We test these predictions in 2d using a new numerical prot
 ocol\, termed `athermal quasi-static random displacement'\, and find that 
 these mean-field predictions are surprisingly accurate in low dimensions. 
 We identify a general class of perturbations that smoothly interpolate bet
 ween the uncorrelated localized forces that occur in the high-persistence 
 limit of dense active matter\, and system-spanning correlated displacement
 s that occur under applied shear. These results suggest a universal framew
 ork for predicting flow\, deformation\, and failure in active and sheared 
 disordered materials. \n\nhttps://arxiv.org/abs/2009.07706
LOCATION:via zoom\, meeting ID 940-1803-7756
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