Packed Swarms on Dirt: Two-Dimensional Incompressible Flocks with Quenched and Annealed Disorder
Packed Swarms on Dirt: Two-Dimensional Incompressible Flocks with Quenched and Annealed Disorder
We show that incompressible polar active fluids can exhibit an ordered, coherently moving phase even in the presence of quenched disorder in two dimensions. Unlike such active fluids with annealed disorder (i.e., time-dependent random white noise) only, which behave like equilibrium ferromagnets with long-range interactions, this robustness against quenched disorder …