Archive ouverte HAL – Origins and diagnostics of the nonequilibrium character of active systems

Lokrshi Prawar Dadhichi 1 Ananyo Maitra 2 Sriram Ramaswamy 3

Journal of Statistical Mechanics: Theory and Experiment, IOP Science, 2018

We present in detail a Langevin formalism for constructing stochastic dynamical equations for active-matter systems coupled to a thermal bath. We apply the formalism to clarify issues of principle regarding the sources and signatures of nonequilibrium behaviour in a variety of polar and apolar single-particle systems and polar flocks. We show that distance from thermal equilibrium depends on how time-reversal is implemented and hence on the reference equilibrium state. We predict characteristic forms for the frequency-resolved entropy production for an active polar particle in a harmonic potential, which should be testable in experiments.

  • 1. TIFR - Tata Institute of Fundamental Research [Hyderabad]
  • 2. LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques
  • 3. IISc Bangalore - Indian Institute of Science [Bangalore]