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Physical scenarios, leading to highly energetic stochastic gravitationalwaves backgrounds (for frequencies ranging from the $\mu$Hz up to the GHz) areexamined. In some cases the typical amplitude of the logarithmic energyspectrum can be even eight orders of magnitude larger than the ordinaryinflationary prediction. Scaling violations in the frequency dependence of theenergy density of the produced gravitons are discussed.Comment: 7 pages in Latex styl

Stochastic gravitational waves backgrounds: a probe for inflationary and non-inflationary cosmology