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- W2047811541 abstract "The production of scalar particles in a homogeneous isotropic spatially flat universe containing classical baryons and radiation is studied for regulated massless free-field theories without trace anomalies. The pair-production probability is evaluated to lowest nonvanishing order in the parameter $ensuremath{xi}=frac{l{ensuremath{rho}}_{b}}{{{ensuremath{rho}}_{r}}^{frac{3}{4}}}$, where $l$ is the Planck length, ${ensuremath{rho}}_{b}$ is the baryon energy density, and ${ensuremath{rho}}_{r}$ is the radiation energy density, all in units where $ensuremath{hbar}=c=1$. For our universe $ensuremath{xi}ensuremath{sim}{10}^{ensuremath{-}27}$. The back reaction regulates the production of scalar particles near the singularity so that the probability to produce a pair in the volume occupied by one baryon over the history of the universe is finite, of order of magnitude $ensuremath{xi}{m}_{b}l$, where ${m}_{b}$ is the mass of a typical baryon, and therefore very small." @default.
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- W2047811541 date "1981-05-15" @default.
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- W2047811541 title "Quantum effects in the early universe. V. Finite particle production without trace anomalies" @default.
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- W2047811541 doi "https://doi.org/10.1103/physrevd.23.2121" @default.
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