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Cosmic vacuum and large-scale perturbations in the concordant model

The evolution of cosmological large-scale perturbations is described in terms of the concordant model based on the recent discovery of cosmic vacuum. It is demonstrated that the process is robustly controlled by a few epoch-independent physical parameters. The parameters guarantee that the initially weak perturbations become nonlinear before (but near) the termination of gravitational instability by cosmic vacuum. No fine tuning for the perturbation amplitude is needed.