2020/05/31 by Christian Maes
Physics and Astronomy · #Active matter #Advanced Thermodynamics and Statistical Mechanics #Classical mechanics #Dissipation #Dynamics (music) #Inertial frame of reference #Langevin equation #Micro and Nano Robotics #Momentum (technical analysis) #Motion (physics) #Non-equilibrium thermodynamics #Physics #Quantum mechanics #Statistical physics #Term (time) #cond-mat.soft #cond-mat.stat-mech #physics.bio-ph #stochastic dynamics and bifurcation
paper · pdf · doi:10.1103/physrevlett.125.208001
published as Phys. Rev. Lett. 125, 208001 (2020)
arxiv created 2020/09/17 · openalex publication_date 2020/11/09 · arxiv updated 2020/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We derive the fluctuation dynamics of a probe in weak coupling with a living medium, modeled as particles undergoing an active Ornstein-Uhlenbeck dynamics. Nondissipative corrections to the fluctuation-dissipation relation are written out explicitly in terms of time correlations in the active medium. A first term changes the inertial mass of the probe as a consequence of the persistence of the active medium. A second correction modifies the friction kernel. The resulting generalized Langevin equation benchmarks the motion induced on probes immersed in active versus passive media. The derivation uses nonequilibrium response theory.