Long-wavelength fluctuation spectra of charged versus neutral one component systems

Microscopic expressions for the long-wavelength excitations of a classical electron gas have been established valid to all orders in the density, charge and plasma expansion parameter. The strengths with which these excitations appear in various space-time autocorrelation functions have also been calculated. Throughout, contact with the corresponding results for neutral particles has been established and their differences discussed. Most notably hereby is the difference between the heat mode of neutral- and charged-particle systems as well as the weak strength with which this mode appears in the correlation functions of the latter systems.