Universality of charge/spin density waves linear properties

Abstract
We reconsider microscopic grounds for the electric field and for the phase dynamics and relaxation of CDW/SDW, mostly for pure systems. We suggest a transparent form dynamic and dissipative equations for the DW phase and for electric field. The approach is based on a helpful relation between a "generalized condensate density" and a complex dielectric susceptibility of intrinsic carriers. Separately for CDW and SDW we discuss the spectra and the attenuation for the TO and LO modes, the low frequency relaxation, the intrinsic nonlinear conductivity.