Static Heterogeneity in Complex Fluids and the Global Effective Fluctuation-dissipation Relation

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• Chiara Pezzotti (Università di Roma La Sapienza)
• Thursday 11 September 2025, 16:00-16:05
• External.

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TGM150 - 9th Edwards Symposium – Frontiers in Statistical Physics and Soft Matter

Particles’ motion in complex fluids displays a variety of deviations from classical Brownian motion, ranging from anomalous diffusion to Fickian yet non-Gaussian diffusion. Several models have been pro- posed to frame these phenomena, usually based on the overdamped approximation, as a consequence of the short timescales for momentum relaxation. Nonetheless, an alternative hydromechanic approach can provide useful insights, by directly accounting for fluid-particle interactions. In this poster presentation, we provide the hydromechanic description of motion in complex fluids, by means of a position-dependent friction factor η(x). A two transition times mean square displacement scaling results as a consequence of the static heterogeneous landscape reproduced by η(x). Moreover, following from a two experiments gedanken system, a global effective fluctuation-dissipation relation is recovered from this model of het- erogeneity, while its failure is shown if starting from the corresponding description in terms of a rough energy landscape.

This talk is part of the Isaac Newton Institute Seminar Series series.

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