Report on scipost_202203_00001v1 Article Swipe
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.21468/scipost.report.4918
· OA: W4296884202
We investigate how the competing presence of a nonuniform motility landscape and an external confining field affects the properties of active particles.We employ the active Ornstein-Uhlenbeck particle (AOUP) model with a periodic swim velocity profile to derive analytical approximations for the steady-state probability distribution of position and velocity, encompassing both the Unified Colored Noise Approximation and the theory of potential-free active particles with spatially dependent swim velocity recently developed.We test the theory by confining an active particle in a harmonic trap, which gives rise to interesting properties, such as a transition from a unimodal to a bimodal (and, eventually multimodal) spatial density, induced by decreasing the spatial period of the self propulsion.Correspondingly, the velocity distribution shows pronounced deviations from the Gaussian shape, even displaying a bimodal profile in the high-motility regions.Our results can be confirmed by real-space experiments on active colloidal Janus particles in external fields.B Derivation of predictions (9) and ( 10) 15 C Multi-scale technique: derivation of Eq. ( 14) 16
