THE TUNNELING, THE 2ND-ORDER RELATIVISTIC PHASE-TRANSITIONS AND PROBLEM OF THE MACROSCOPIC UNIVERSE ORIGIN

We propose that the Universe was created from ''Nothing'' with a relat ively small number of particles and it very quick relaxed to a quasi-e quilibrium state at tile Planck parameters. The classic cosmological s olution for this Universe, with the calculation of its ability to unde rgo the second order relativistic phase transition (RPT), has two bran ches divided by a gap. On one of these branches near to the ''Nothing' ' state the second order RPT is not possible at the GUT scale. The oth er branch is thermodynamically unstable. The quantum process of tunnel ing between the cosmological solution branches and the kinetics of the second order RPT are investigated by numerical methods. Another quant um geometrodynamics process (bounce from singularity) is also taken in to consideration. It is shown that the discussed phenomenon with the c alculation of all RPTs from the GUT scale (10(16) Gev) to the Salam-We inberg scale (10(2) Gev) gives the new cosmological scenarios of the m acroscopic Universe origin with the observable number of particles.