Abstract

Colloids and dusty plasmas play an important role in natural hazards such as virus infections (colloids) and atmospheric pollution (dusty plasmas). Waves, excited by Brownian motion, are essential for diagnostics. For charged colloids a visco-elastic theory and an extension of the theory of Felderhof and Jones are used to derive the damping rates of the longitudinal and transverse modes respectively. For the dispersion relations of (propagating) waves in dusty plasmas a new kinetic theory is developed. All theoretical dispersion relations are compared with experimental and numerical data.

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