[en] The probability for the universe to have been created from 'nothing' in a state with Euclidean action Ssub(E) is known to be P=A exp(-|Ssub(E)|). Starting from a broken-symmetry theory of gravity, with Lagrangian density L=(1/2)epsilonphi²R+(1/2)phisub(;k)phisup(;k)-V(phi)+βR²ln(R/μ²), we construct a quasi-de-Sitter space-time which corresponds to the most likely configuration, with Ssub(E)=0, and whose vacuum energy density is within the limits set by observations of the anisotropy of the cosmological microwave background radiation. (author)