In this work, we study the stationary behavior of an assembly of independent
chiral active particles under confinement by employing an extension of the
active Ornstein-Uhlenbeck model. The chirality modeled by means of an effective
torque term leads to a drastic reduction of the accumulation near the walls
with respect to the case without handedness and to the appearance of currents
parallel to the container walls accompanied by a large accumulation of
particles in the inner region. In the case of two-dimensional chiral particles
confined by harmonic walls, we determine the analytic form of the distribution
of positions and velocities in two different situations: a rotationally
invariant confining potential and an infinite channel with parabolic walls.
Both these models display currents and chirality induced inner accumulation.
These phenomena are further investigated by means of a more realistic
description of a channel, where the wall and bulk regions are clearly
separated. The corresponding current and density profiles are obtained by
numerical simulations. At variance with the harmonic models, the third model
shows a progressive emptying of the wall regions and the simultaneous
enhancement of the bulk population. We explain such a phenomenology in terms of
the combined effect of wall repulsive forces and chiral motion and provide a
semiquantitative description of the current profile in terms of an effective
viscosity of the chiral gas.Comment: 5 figure
