Active matter, which ranges from molecular motors to groups of animals, exists at different
length scales and timescales, and various computational models have been proposed to …

Differently from passive Brownian particles, active particles, also known as self-propelled
Brownian particles or microswimmers and nanoswimmers, are capable of taking up energy …

Active colloids are microscopic particles, which self-propel through viscous fluids by
converting energy extracted from their environment into directed motion. We first explain …

We review the literature on swimming in complex fluids. A classification is proposed by
comparing the length-and timescales of a swimmer with those of nearby obstacles …

Active systems are driven out of equilibrium by exchanging energy and momentum with their
environment. This endows them with anomalous mechanical properties that are reviewed in …

The pressure of suspensions of self-propelled objects is studied theoretically and by
simulation of spherical active Brownian particles (ABPs). We show that for certain …

Motility is a fundamental survival strategy of bacteria to navigate porous environments,
where they mediate essential biogeochemical processes in quiescent wetlands and …

Both, in their natural environment and in a controlled experimental setup, microswimmers
regularly interact with surfaces. These surfaces provide a steric boundary, both for the …

The extent to which active matter might be described by effective equilibrium concepts like
temperature and pressure is currently being discussed intensely. Here, we study the …

The concept of swim pressure quantifies the average force exerted by microswimmers on
confining walls in nonequilibrium. Here we explore how the swim pressure depends on the …