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Analytical solutions are obtained for the early cosmological phases in thescale invariant models with curvature k=0. They complete the analyticalsolutions already found in the matter--dominated era by (Jesus 2018). Thephysical properties in the radiative era are derived from the conservation lawsand compared to those of current standard models. The critical runs of thetemperature T(MeV) and of the expansion rate H of the scale invariant modelswith low densities, Omega_m=0.04, are quite similar at the time ofnucleosynthesis to those of standard models with Omega_m=0.30, leading to thesame freezing number ratio of neutrons to protons.These results are consistentwith the fact that the scale invariant models appear to not require thepresence of dark matter.

Evolution of the early Universe in the scale invariant theory