NASA NTRS · 19910039932
Closed baryonic Universe from photon cooling
Abstract
The Universe may be critically closed by baryons and not conflict with standard big-bang nucleosynthesis if the comoving number density of photons is reduced after nucleosynthesis. This is accomplished at a temperature of order 10 keV by recoupling the photons to a cold hidden sector via a photon-mixing mechanism. Signatures from supernovae, neutrino backgrounds, and nucleosynthesis are discussed.
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Bartlett, J. G., Hall, L. J.. 1991-02-04. Closed baryonic Universe from photon cooling. https://ntrs.nasa.gov/citations/19910039932
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