Thermal radiation produced by the expansion of the Universe

@article{Parker1976ThermalRP,
title={Thermal radiation produced by the expansion of the Universe},
author={Leonard Parker},
journal={Nature},
year={1976},
volume={261},
pages={20-23}
}
I show here that the expansion of the Universe can create particles with a black-body distribution. I give a simple model in which the creation of particles in an initially empty space time 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 thermalising processes have had a chance to act. If the particle creation occurs near the Planck time, the entropy produced is…
48 Citations
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