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SUMMARY:Static Heterogeneity in Complex Fluids and the Global Effective Fl
 uctuation-dissipation Relation - Chiara  Pezzotti  (Università di Roma La
  Sapienza)
DTSTART:20250911T150000Z
DTEND:20250911T150500Z
UID:TALK235771@talks.cam.ac.uk
DESCRIPTION:Particles&rsquo\; motion in complex fluids displays a variety 
 of deviations from classical Brownian motion\, ranging from anomalous diff
 usion to Fickian yet non-Gaussian diffusion. Several models have been pro-
  posed to frame these phenomena\, usually based on the overdamped approxim
 ation\, as a consequence of the short timescales for momentum relaxation. 
 Nonetheless\, an alternative hydromechanic approach can provide useful ins
 ights\, by directly accounting for fluid-particle interactions. In this po
 ster presentation\, we provide the hydromechanic description of motion in 
 complex fluids\, by means of a position-dependent friction factor &eta\;(x
 ). A two transition times mean square displacement scaling results as a co
 nsequence of the static heterogeneous landscape reproduced by &eta\;(x). M
 oreover\, following from a two experiments gedanken system\, a global effe
 ctive fluctuation-dissipation relation is recovered from this model of het
 - erogeneity\, while its failure is shown if starting from the correspondi
 ng description in terms of a rough energy landscape.
LOCATION:External
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