Universality of a dynamical percolative approach to 1/f

A dynamical percolative model explaining the universality of $1/f^{\gamma}$ 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 $\tau^{-1}$, as in McWhorter's model. The impact of these results with respect to recent self-organised criticality models is discussed