Levke Ortlieb


Statistics of swimmer and tracer movement in an active fluid: experiments and models in comparison


In this master’s thesis the diffusion of small passive particles in the presence of self-propelled micro-algae was investigated experimentally. The data allowed to compute the probability density function, the mean squared displacement and the kurtosis of tracer displacements over several orders of magnitude. This made a comparison with theoretical models and the rejection of some of them possible.