Quantum aspects of classical and statistical fields

摘要: A generating functional for a classical system described by coordinates satisfying nonlinear equations of motion is constructed in terms which any the system's phase-space trajectory may be expressed. Statistical behavior arising from either random initial conditions or stirring forces handled simply within this theory. The analogy with Feynman's action-integral formalism quantum theory provides an alternative approach to operator methods recently developed Martin, Siggia, and Rose. connection earlier work Onsager, Machlup, Graham also pointed out.