SKM 2023 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 23: Single Molecule Biophysics
BP 23.8: Vortrag
Donnerstag, 30. März 2023, 11:45–12:00, BAR 0106
A variance sum rule and its entropy production estimation — •Ivan Di Terlizzi1,2, Marta Gironella3, Marco Baiesi3, and Felix Ritort2 — 1Max Planck Institute for the Physocxs of complex systems — 2University of Padua — 3University of Barcelona
Nonequilibrium steady states, from the planetary scale to biological processes, are characterized by entropy production via energy dissipation to the environment, which is often challenging to measure. A novel variance sum rule sets a new resource for exploiting fluctuations to measure physical quantities in stochastic systems. In particular, we focus on the formula it gives for estimating the entropy production rate from trajectories of positions and forces. We describe this method with analytically solvable models and we show its robustness and usefulness in practical applications to experimental data. By introducing a model-dependent fitting procedure, the method is also adapted to deal with conditions where not all degrees of freedom are experimentally accessible. For example, by analysing traces of flickering red blood cells, we obtain estimates of the entropy production rate in line with values obtained with totally different thermodynamic techniques.