Deruelle, Nathalie, 1952-Garriga Torres, JaumeVerdaguer Oms, Enric, 1950-2010-05-062010-05-0619910556-2821https://hdl.handle.net/2445/12409We propose a simple geometrical prescription for coupling a test quantum scalar field to an "inflaton" (classical scalar field) in the presence of gravity. When the inflaton stems from the compactification of a Kaluza-Klein theory, the prescription leaves no arbitrariness and amounts to a dimensional reduction of the Klein-Gordon equation. We discuss the possible relevance of this coupling to "reheating" in inflationary cosmologies.6 p.application/pdfeng(c) The American Physical Society, 1991Relativitat (Física)GravitacióCosmologiaAstrofísicaRelativity (Physics)GravitationCosmologyAstrophysicsinfo:eu-repo/semantics/article79617info:eu-repo/semantics/openAccess