From Interacting Particles to Equilibrium Statistical Ensembles

Understand

We argue that a particle language provides a conceptually simple framework for the description of anomalous equilibration in isolated quantum systems.

• We address this paradigm in the context of integrable models, which are those with particles that are stable against decay.
• In particular, we demonstrate that a complete description of equilibrium ensembles for interacting integrable models requires a formulation built from the mode occupation numbers of the underlying particle content, mirroring the case of non-interacting particles.
• This yields an intuitive physical interpretation of generalized Gibbs ensembles, and reconciles them with the microcanonical ensemble.