Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 35: Brownian Motion and Transport

DY 35.5: Vortrag

Freitag, 15. März 2013, 10:30–10:45, H48

Fluctuations and equipartition in the dynamics of granular ratchets — •Johannes Blaschke and Jürgen Vollmer — Max Planck Institute for Dynamics and Self-Organization, Göttingen

Collisions involving granular particles exhibit dissipative kinematics. Hence, the motion of granular particles cannot be described using thermodynamics alone, warranting an examination of theories of non-equilibrium steady states and fluctuation theorems.

We examine the motion of a macroscopic wedge-shaped particle (constrained to only move along the x-axis) encountering dissipative collisions with granular gas particles. Based on a general stochastic model, we derive the full PDF of the wedge's motion. Contrary to what is observed for a Maxwell-Boltzmann gas, vanishingly small perturbations to the gas velocity PDF (e.g. via shaking) result in a steady-state drift velocity independent of wedge mass in the limit of a massive particle.