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DY: Fachverband Dynamik und Statistische Physik

DY 36: Stochastic Thermodynamics

DY 36.2: Vortrag

Mittwoch, 18. März 2020, 10:15–10:30, ZEU 147

Stochastic thermodynamics of processes coupled to finite reservoirs — •Jonas Fritz, Basile Nguyen, and Udo Seifert — II. Institut für Theoretische Physik, Universität Stuttgart, Stuttgart, Germany

Biomolecular processes are typically modeled using chemical reaction networks coupled to infinitely large chemical reservoirs. Through a chemical free energy difference between reservoirs, the system can be driven into a non-equilibrium steady state (NESS). In reality, cells are finite systems containing a finite number of molecules. In such systems, a NESS can be reached with the help of an externally driven pump. We introduce a simple model for finite-size chemical reservoirs with such a pumping mechanism. Crucial parameters then are the pumping rate and the size of the chemical reservoir. We apply this model to a simple biochemical oscillator, the Brusselator, and quantify the performance using the number of coherent oscillations. As a surprising result, we find that higher precision can be achieved with finite-size reservoirs, even though fluctuations there are larger.