Active Ornstein-Uhlenbeck particles retain a Brownian f^{-2} spectrum in free space with a persistence-frequency crossover, while confinement produces a two-plateau structure from double trapping and an f^{-4} regime from ballistic transients.
Szamel, Self-propelled particle in an external poten- tial: Existence of an effective temperature, Phys
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Power spectral density of trajectories of active Ornstein-Uhlenbeck particles
Active Ornstein-Uhlenbeck particles retain a Brownian f^{-2} spectrum in free space with a persistence-frequency crossover, while confinement produces a two-plateau structure from double trapping and an f^{-4} regime from ballistic transients.