Fig. 6: Parametric representation of the Fluctuation-Dissipation theorem at different wave numbers q for activity parameters (λ, ξ) = (1, 4).
From: Effective energy, interactions and out of equilibrium nature of scalar active matter
The integrated response function χ(q, t) at wave number q is plotted as a function of the autocorrelation function C(q, t) at wave number q. The typical length scale corresponding to wave number q is denoted ℓ = 2π/q. The dashed line corresponds to the equilibrium FDT, where D is the noise amplitude. The deviation is the strongest at intermediate q values, which correspond to the size at which the effective potentials display long-range interactions and to the size of the bubbles in the micro-separated phase.
