QUASI-PARTICLE DESCRIPTIONS IN CLASSICAL MANY PARTICLE SYSTEMS.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1969
- Accession Number
- AD0686856
Entities
People
- N. Marcuvitz
Organizations
- New York University