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Dynamics of a homogeneous active dumbbell system
Antonio Suma1, Giuseppe Gonnella2, Gianluca Laghezza2
1SISSA-Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, 34136 Trieste, Italy.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 11, 2014
Summary
We studied active dumbbell systems, finding their diffusion and response depend non-monotonically on activity. Effective temperature increases with activity, showing complex behavior linked to cluster formation.
Area of Science:
- Physics
- Soft Matter Physics
- Statistical Mechanics
Background:
- Active matter systems exhibit complex dynamics beyond equilibrium.
- Understanding the interplay of activity, density, and temperature is crucial for predicting emergent behaviors.
Purpose of the Study:
- To analyze the dynamics of a 2D system of interacting active dumbbells.
- To characterize mean-square displacement, linear response, and fluctuation-dissipation theorem deviation.
- To investigate the influence of activity strength, packing fraction, and temperature.
Main Methods:
- Simulations of a two-dimensional system of interacting active dumbbells.
- Analysis of mean-square displacement and linear response functions.
- Calculation of deviation from the equilibrium fluctuation-dissipation theorem.
Main Results:
- Diffusion constant increases with activity and decreases with packing fraction.
- Non-monotonic dependence of finite-density to single-particle diffusion ratio on activity.
- Effective temperature is higher than ambient, increases with activity, and shows complex dependence on density and packing fraction, linked to cluster formation.
Conclusions:
- Active dumbbell systems display non-trivial dynamics and deviations from equilibrium.
- Effective temperature is a key indicator of non-equilibrium behavior, influenced by activity and density.
- Finite-size cluster formation plays a significant role in the observed dynamics at low temperatures.
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