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Theoretical analysis uncovers conditions for power law fluctuations in stochastic systems, indicating significant behavior of random amplification effects.
A general discrete stochastic process involving random amplification with additive external noise is analyzed theoretically and numerically. Necessary and sufficient conditions to realize steady power law fluctuations with divergent variance are clarified. The power law exponent is determined by a statistical property of amplification independent of the external noise. By introducing a nonlinear effect a stretched exponential decay appears in the power law.
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Takayasu et al. (1997) studied this question.
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