Thermal radiation produced by the expansion of the Universe

Details Thermal radiation produced by the expansion of the Universe Thermal radiation produced by the expansion of the Universe

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261...20p&link_type=abstract

Nature, vol. 261, May 6, 1976, p. 20-23. NSF-supported research.

Astronomy and Astrophysics

Astronomy

46

Black Body Radiation, Cosmology, Particle Production, Relativistic Particles, Thermal Radiation, Astronomical Models, Einstein Equations, Energy Spectra, Relativity, Universe

Scientific paper

It is shown that the expansion of the Universe can create particles with a black-body distribution. A simple model is presented in which the creation of particles in an initially empty spacetime leads at very early times to a Friedmann expansion dominated by hot relativistic particles (probably including gravitons) having a black-body spectrum, even before classical thermalizing processes have had a chance to act. If the particle creation occurs near the Planck time, the entropy produced is consistent, in order of magnitude, with that required by the Einstein equations. The conditions in which one achieves consistency with the observed 3 K black-body radiation are also discussed.

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