2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201447We investigate the cosmological signatures of instantons mediating tunneling between de Sitter minima. For generic potentials the Coleman-de Luccia instanton does not necessarily exist; when it does not, the instanton which contributes to the decay rate is the trivial constant solution, known as the Hawking-Moss instanton. With the aid of a toy model we interpret this solution and describe the resulting cosmology. In neither the Coleman-de Luccia nor Hawking-Moss case can the resulting cosmology be closed. An observation of significant positive curvature would therefore rule out the possibility that our universe arose from any transition from a neighboring minimum in the string-theory landscape.19 pages, 3 figures; references added, typos correctedHigh Energy Physics - TheoryAstrophysicsGeneral Relativity and Quantum Cosmologytext