RT Journal Article T1 Kinetic dominance and the wave function of the Universe A1 Álvarez Galindo, Gabriel A1 Martínez Alonso, Luis A1 Medina Reus, Elena AB We analyze the emergence of classical inflationary universes in a kinetic-dominated stage using a suitable class of solutions of the Wheeler-DeWitt equation with a constant potential. These solutions are eigenfunctions of the inflaton momentum operator that are strongly peaked on classical solutions exhibiting either or both a kinetic-dominated period and an inflation period. Our analysis is based on semiclassical WKB solutions of the Wheeler-DeWitt equation interpreted in the sense of Borel (to perform a correct connection between classically allowed regions) and on the relationship of these solutions to the solutions of the classical model. For large values of the scale factor the WKB Vilenkin tunneling wave function and the Hartle-Hawking no-boundary wave functions are recovered as particular instances of our class of wave functions. PB Amer Physical Soc SN 2470-0010 YR 2022 FD 2022-04-06 LK https://hdl.handle.net/20.500.14352/71719 UL https://hdl.handle.net/20.500.14352/71719 LA eng NO © 2022 American Physical Society.The financial support of the Spanish Ministerio de Economia y Competitividad under Project No. PGC2018094898-B-I00 is gratefully acknowledged. NO Ministerio de Economia y Competitividad (MINECO) DS Docta Complutense RD 6 oct 2024