  Jamming is ubiquitous in disordered systems, but the critical behavior of
jammed solids subjected to active forces or thermal fluctuations remains
elusive. In particular, while passive athermal jamming remains mean-field-like
in two and three dimensions, diverse active matter systems exhibit anomalous
scaling behavior in all physical dimensions. It is therefore natural to ask
whether activity leads to anomalous scaling in jammed systems. Here, we use
numerical and analytical methods to study systems of active, soft, frictionless
spheres in two dimensions, and elucidate the universal scaling behavior that
relates the excess coordination, active forces or temperature, and pressure
close to the athermal jammed point. We show that active forces and thermal
effects around the critical jammed state can again be captured by a mean-field
picture, thus highlighting the distinct and crucial role of amorphous structure
in active matter systems.
