# SKM 2023 – wissenschaftliches Programm

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# DY: Fachverband Dynamik und Statistische Physik

## DY 35: Statistical Physics of Biological Systems I (joint session BP/DY)

### DY 35.12: Vortrag

### Donnerstag, 30. März 2023, 12:45–13:00, TOE 317

**Stochastic heat production in phase-separated systems out of equilibrium** — •Kathrin Laxhuber, Jonathan Bauermann, and Frank Jülicher — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Phase-separated multi-component systems in the presence of chemical reactions provide interesting examples of non-equilibrium systems. We complement the dynamics of phase separation by a heat transport equation which is coupled to diffusive matter transport. On a microscopic scale, fluctuations become relevant, which we include by developing a stochastic lattice model that we link to the macroscopic continuum dynamics. We then implement this model in a kinetic Monte Carlo simulation of spatial flows of energy and matter as well as local reactions. By coupling to reservoirs or by fueling reactions, a system can be driven out of equilibrium. Using a toy system of a single phase-separated droplet, we discuss how temperature fluctuations affect the droplets' dynamics and the noise in the system. We furthermore show how the fluxes due to the driving give rise to a stochastic production of latent heat and reaction heat. The systems we discuss serve as models for biological condensates and the study of energetics in cells.