2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/167106A baby-universe model of cosmic inflation is analyzed using quantum Darwinism. In this model cosmic inflation can be approximated as Brownian motion of a quantum field, and quantum Darwinism implies that decoherence is the result of quantum Brownian motion of the wave function. The quantum Darwinism approach to decoherence in the baby-universe cosmic-inflation model yields the decoherence times of the baby-universes. The result is the equation relating the baby-universe's decoherence time with the Hubble parameter. A brief discussion of the relation between Darwinism and determinism is provided in the Appendix.Latex, 15 pages. Alterations to improve clarity of text, added referencesHigh Energy Physics - TheoryGeneral Relativity and Quantum CosmologyQuantum Physicstext