Media type: E-Article Title: On the Particle-Defining Modes for a Free Neutral Scalar Field in Spatially Homogeneous and Isotropic Universes Contributor: Kodama, H. imprint: Oxford University Press (OUP), 1981 Published in: Progress of Theoretical Physics Language: English DOI: 10.1143/ptp.65.507 ISSN: 0033-068X; 1347-4081 Keywords: Physics and Astronomy (miscellaneous) Origination: Footnote: Access State: Open Access