Universality of a dynamical percolative approach to 1/fγ noise
Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146 Genova, Italy
Revised: 22 May 2001
Published online: 15 October 2001
A dynamical percolative model explaining the universality of noise is reported. Exponents γ ranging from 0 to 2 are obtained under the hypothesis that noise originates from random switching events between two ON-OFF states in elemental parts (switchers) of a physical system. The usual noise behaviour with γ very close to 1 in an arbitrarily wide frequency range is obtained assuming a statistical distribution of switcher relaxation time τ proportional to , as in McWhorter's model. The impact of these results with respect to recent self-organised criticality models is discussed.
PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 64.60.Ak – Renormalization-group, fractal, and percolation studies of phase transitions / 05.40.Ca – Noise / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001