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A characteristic feature of the Fourier Power Density Spectrum (PDS) observed from black hole X‐ray binaries in low/hard and intermediate spectral states is a broad band‐limited noise, characterized by a constant below some frequency (a “break” frequency) and a power law above this frequency. It has been shown that the variability of this type can be produced by the inward diffusion of the local driving perturbations in a bounded configuration (accretion disk or corona). In the framework of this model, the perturbation diffusion time t0 is related to the phenomenological break frequency, while the PDS power‐law slope above the “break” is determined by the viscosity distribution over the configuration. The perturbation diffusion scenario explains the decay of the power of X‐ray variability observed in a number of compact sources (containing black hole and neutron star) during an evolution of theses sources from low/hard to high/soft states. We compare the model predictions with the subset of data from Cyg ...

On the nature of the variability power decay towards soft spectral states in X-ray binaries. Case study in Cyg X-1