Self-excitation of a nonlinear scalar field in a random medium
AUTOR(ES)
Zeldovich, Ya. B.
RESUMO
We discuss the evolution in time of a scalar field under the influence of a random potential and diffusion. The cases of a short-correlation in time and of stationary potentials are considered. In a linear approximation and for sufficiently weak diffusion, the statistical moments of the field grow exponentially in time at growth rates that progressively increase with the order of the moment; this indicates the intermittent nature of the field. Nonlinearity halts this growth and in some cases can destroy the intermittency. However, in many nonlinear situations the intermittency is preserved: high, persistent peaks of the field exist against the background of a smooth field distribution. These widely spaced peaks may make a major contribution to the average characteristics of the field.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=299066Documentos Relacionados
- UM MÉTODO PARA A ANÁLISE DA RESSONÂNCIA SUBSÍNCRONA DEVIDO A AUTO-EXCITAÇÃO
- Scalar field cosmology in three-dimensions
- Tachyonic field interacting with scalar (phantom) field
- Attractors in dark energy models with Born-Infeld scalar field
- Casimir effect for a massive scalar field under mixed boundary conditions