SKM 2023 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 44: Poster: Statistical Physics
DY 44.18: Poster
Thursday, March 30, 2023, 13:00–16:00, P1
Non-Markovian modeling of non-equilibrium fluctuations and dissipation in active viscoelastic biomatter — •Amir Abbasi1, Roland R. Netz1, and Ali Naji2 — 1Freie University of Berlin, Berlin, Germany — 2Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
Viscoelastic gels such as permanently or transiently cross-linked networks of semiflexible polymers are important soft biological materials. The polymeric nature of such gels is responsible for their salient rheological properties, including their frequency-dependent response to external forces.
Here, based on a Hamiltonian that incorporates the elastic coupling between a tracer and active particles, we derive a generalized Langevin model for the non-equilibrium mechanical response of active viscoelastic biomatter. Our model accounts for the power-law viscoelastic response of the embedding polymeric network as well as for the non-equilibrium energy transfer between active and tracer particles. Our analytical expressions for the frequency-dependent response function and the positional autocorrelation function agree nicely with experimental data for red blood cells and actomyosin networks with and without ATP. The fitted effective active-particle temperature, elastic constants and effective friction coefficients of our model allow straightforward physical interpretation.