Small perturbation H' = –A(t)f(t) gives ⟨B(t)⟩ = ∫χ_BA(t–t') f(t') dt' with response function χ_BA computable from equilibrium correlations (Kubo). Provides the bridge between equilibrium microdynamics and transport coefficients.
Linear response theory
Related concepts
- Boltzmann entropy formula
- Fluctuation-dissipation theorem
- Boltzmann transport equation
- Green–Kubo formula
- Jarzynski equality
- Crooks fluctuation theorem
- Gallavotti–Cohen fluctuation theorem
- Stochastic thermodynamics
- Onsager reciprocal relations
- Large-deviation principle
- Hydrodynamic limit
- Thermodynamic uncertainty relation (TUR)