Published online by Cambridge University Press: 04 August 2017
At present cosmology experiences a qualitatively new state of its development. Up to now cosmological theory successfully extrapolated to the past the Universe we observe now. This extrapolation was reliable up to the temperatures T ∼1010K. The endeavors to advance nearer to the singularity imply that even cardinally new hypotheses in the elementary particle physics (e.g. Hagerdorn's hypothesis) brought about the relatively insignificant variations in cosmology—the Universe expansion rate obeyed the power law as before, the main features of the cosmological model (homogeneity, singularity, the existence of horizone, etc.) remained unchanged.