A swimmer is an object (usually immersed in fluid) which manages to translate itself in space by cyclically deforming its shape with no need for externally exerted net force. At the low Reynolds number regime, swimming becomes geometric (in a sense to be explained). The talk will concentrate mostly on the general framework for describing and calculating such swimming. I will also briefly show a few examples of swimmers I have worked on.
Sink or swim: This nano-swimmer moves forward by expanding and contracting two rods connecting three spheres. This image shows each stage in the cycle.