2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/198217For the simplest minisuperspace model based on a homogeneous, isotropic metric and a minimally coupled scalar field we derive analytic expressions for the caustic which separates Euklidean and Minkowskian region and its breakdown value $\p_*$. This value represents the prediction of the no-boundary wave function for the scalar field at the beginning of inflation. We use our results to search for inflationary models which can render the no-boundary wave function consistent with the requirement of a sufficiently long inflationary period.11 pages, TUM-HEP-206/94, 2 figures (added as uu-encoded postscript file)General Relativity and Quantum Cosmologytext