Navigation   about theory   people   projects   publications   review   simulations   home		Long-time Tails Do Not Necessarily Imply Self-organized Criticality or the Breakdown of the Standard Transport Paradigm Authors: John A. Krommes and Maurizio Ottaviani Date of PPPL Report: January 2000 Submitted to: Physics of Plasmas Numerical measurements and analytical studies are performed on a stochastic model with features relevant to plasma confinement. Although the model lacks crucial features of self-organized criticality (SOC) and its transport can be computed by standard techniques, it nevertheless exhibits intermittency and algebraic time correlations. This suggests that SOC need not be the explanation for observed long-time tails in experimental fluctuation data. Arguments based on the renormalized spectral balance equation, and simulation of a standard nonlinear paradigm, predict a range of Hurst exponents in reasonable agreement with the observations without invoking submarginal dynamics.
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