Physics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8227203n&link_type=abstract
Unknown
Physics
Astronomical Models, Cosmic Rays, Einstein Equations, Scalars, Field Theory (Physics), Ionization Frequencies, Ionizing Radiation, Mathematical Models
Scientific paper
The positive frequency part in the beginning of the cosmic expansion for a quantized field in the pair creation of the corresponding particles in an early universe is discussed. The definition of a positive frequency part for a canonically quantized massive or massless scalar field coupled conformally or minimally to one of several isotropic universes with flat 3 space is examined. The validity of a modified thermal law for the production of massive scalar particles coupled conformally to the Chitre-Hartle universe is not universal. A counterplan to remove the difficulty in defining the required positive frequency part for a massive scalar field in the radiation dominated Friedmann universe is also discussed.
Azuma Takehiro
Nariai Hidekazu
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