QUANTUM SCALE OF INFLATION AND PARTICLE PHYSICS OF THE EARLY UNIVERSE

The quantum gravitational scale of inflation is calculated by finding a sharp probability peak in the distribution function of chaotic infla tionary cosmologies driven by a scalar field with large negative const ant xi of nonminimal interaction. In the case of the no-boundary state of the universe this peak corresponds to the eternal inflation, while for the tunnelling quantum state it generates a standard inflationary scenario. The sub-Planckian parameters of this peak (the mean value o f the corresponding Hubble constant H congruent-to 10(-5)m(P), its qua ntum width DELTAH/H congruent-to 10(-5) and the number of inflationary e-foldings N congruent-to 60) are found to be in good correspondence with the observational status of inflation theory, provided the coupli ng constants of the theory are constrained by a condition which is lik ely to be enforced by the (quasi) supersymmetric nature of the sub-Pla nckian particle physics model.