Plasma model and Drude model permittivities in Lifshitz formula

Abstract At the physical level of rigour it is shown that there are no substantial theoretical arguments in favour using either plasma mode permittivity or Drude model Lifshitz formula. The decision this question rests with comparison calculations experiment. In course study derivation fluctuation–dissipation theorem proposed where displayed clear at which reasoning stage and what way dissipation taken into account. particular how works case system reversible dynamics, when absent. Thereby proved explicit assertion according to inapplicable systems without erroneous. research based on making use rigorous formalism equilibrium two-time Green functions statistical physics finite temperature.