title: Enhanced diffusion and ordering of self-propelled rods.
abstract: Starting from a minimal physical model of self-propelled hard rods on a substrate in two dimensions, we derive a modified Smoluchowski equation for the system. Self-propulsion enhances longitudinal diffusion and modifies the mean-field excluded volume interaction. From the Smoluchowski equation we obtain hydrodynamic equations for rod concentration, polarization and nematic order parameter. New results at large scales are a lowering of the density of the isotropic-nematic transition and a strong enhancement of boundary effects in confined self-propelled systems.
authors.affiliation: Physics Department, Syracuse University, Syracuse, New York 13244, USA.
authors.forename: Aparna
authors.initials: A
authors.lastname: Baskaran
authors.forename: M Cristina
authors.initials: MC
authors.lastname: Marchetti