Dresden 2026 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 18: Active Matter III (joint session BP/CPP/DY)
DY 18.7: Vortrag
Dienstag, 10. März 2026, 11:15–11:30, BAR/SCHÖ
Fluctuation-Response Theory of Non-Equilibrium Complex Fluids — •Ryota Takaki1 and Frank Jülicher1,2,3 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2Center for Systems Biology Dresden, Dresden, Germany — 3Cluster of Excellence Physics of Life, TU Dresden, Dresden, Germany
Active soft materials such as cytoplasm and tissues are constantly driven by chemical reactions and often retain long-lived mechanical memory. In this work, we develop a generalized hydrodynamic framework applicable to non-equilibrium fluids with memory at finite wavevectors and frequencies. Our approach is based on exact correlation-function identities, leading to a fluctuation-response relation for steady states, including non-equilibrium. Applying the theory to chemically driven active fluids, we uncover Active Viscoelastic Memory, in which reaction cycles dynamically renormalize the viscous response and can generate negative storage moduli at finite frequency, absent in conventional viscoelastic materials. Our results provide a first-principles basis for modeling memory-dependent dynamics in a broad class of biological and synthetic active systems, and suggest concrete rheological signatures of chemical driving that can be tested experimentally.
Keywords: active matter; Fluctuation-response relation; Non-equilibrium steady states