QUASI-PARTICLE DESCRIPTIONS IN CLASSICAL MANY PARTICLE SYSTEMS.
NEW YORK UNIV BRONX DEPT OF ELECTRICAL ENGINEERING
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Quasi-particle descriptions of thermal or weakly turbulent fluctuations in classical many particle systems may be based on a complete set of eigen-modes which, for a Maxwell-Vlasov electron plasma, comprise a set of continuous and discrete modes, both longitudinal and transverse. The continuum modes are dressed single particle excitations with real eigenvalues they can be expressed alternatively in terms of discrete quasi-modes corresponding to complex quasi-eigenvalues on the unphysical sheet of the complex energy frequency plane. For weakly correlated fluctuations such quasi-mode representations can be interpreted in terms of quasi-particles moving in their phase space along trajectories determined by dispersion energy relations characteristic of the quasi-modes the quasi-particle density in phase space is determined by the amplitude correlation spectrum of the quasi-modes. The specifics of this quasi-particle viewpoint are discussed for the case of an electron plasma. Author
- Plasma Physics and Magnetohydrodynamics