Publication Date:
2011-08-19
Description:
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.
Keywords:
ASTROPHYSICS
Type:
Physical Review Letters (ISSN 0031-9007); 66; 541-544
Format:
text
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