A scenario for the initial evolution of a universe providing the observed number of particles

Details A scenario for the initial evolution of a universe providing the observed number of particles A scenario for the initial evolution of a universe providing the observed number of particles

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..711b&link_type=abstract

Astronomy Reports, Volume 42, Issue 6, November 1998, pp.711-721

Astronomy and Astrophysics

Astronomy

Scientific paper

It is proposed that the Universe was born from `nothing' with a relatively small number of particles and relaxed very quickly into a quasi-equilibrium state with the Planck parameters. The classical cosmological solution for such a Universe with a cosmological constant Gamma and a number of particles less than the critical number has two branches separated by a gap (quasi-Friedmann and quasi-de Sitter). The quantum process of tunneling between these branches and the kinetics of relativistic phase transitions in a SU(5) supersymmetry model at energies of ~10^16 GeV are investigated using numerical methods. The Einstein equations are solved together with the equations of relaxation kinetics. Another quantum-geometrical process (a `bounce' from a singularity) and the Wheeler-de Witt equation are also considered. A model of a slowly expanding Universe that can generate the observed number of particles arises in a natural way as a result of multiple repetitions of cosmological cycles. Results of the first computer experiments to study in detail the problem of particle formation in the early Universe are presented. These experiments showed that, due to the rapidity of the relaxation processes and the lack in the inflanton potential of singularties capable of keeping the system in a supercooled phase, the usually envisioned inflatory regime does not arise.

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