Physics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jpha...11.1583a&link_type=abstract
Journal of Physics A - Mathematical and General, vol. 11, Aug. 1978, p. 1583-1602.
Physics
33
Cosmology, Particle Production, Space-Time Functions, Astronomical Models, Conformal Mapping, Dirac Equation, Heuristic Methods, Temperature Distribution, Wentzel-Kramer-Brillouin Method
Scientific paper
Creation of massive spin-1/2 particles in a 3-flat Robertson-Walker universe where R is proportional to the square root of time (radiation dominated universe) is studied with Fock space methods. The universe is thereby completed in 'passing through the singularity' by a time-symmetric (mirror-like) contracting universe preceding the singularity. The respective procedure to do so for Dirac test fields (conformal method) is discussed in detail. For the asymptotic in- and out-regions a WKB particle interpretation is applied. It is found that particles are created with a nonrelativistic thermal spectrum. The expressions for the number density, energy density and pressure of the created particles confirm this result (equation of state). The study of the development in time of the creation process shows that 99% of the particles created all together are created at about the Compton time.
Audretsch J"urgen
Schaefer Gail
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