The distortions of the microwave background radiation, heavy neutral decaying leptons and decaying gravitinos

Details The distortions of the microwave background radiation, heavy neutral decaying leptons and decaying gravitinos The distortions of the microwave background radiation, heavy neutral decaying leptons and decaying gravitinos

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phlb..163..236s&link_type=abstract

Physics Letters B, Volume 163, Issue 1-4, p. 236-242.

Physics

7

Scientific paper

Recent measurements of the spectral distortuons of the cosmic microwave background radiation (CBR) indicate that the chemical potential μ of the photon gas filling the early universe is less than O(10-2) and might be as small as 10-3, 10-4. We have reinvestigated the bounds derived from this low value of μ, integrating numerically the evolution in time of the typical length scale factor of the universe, the entropy per baryon and the chemical potential of photons. A heavy ``Dirac'' neutrino is much more constrained than a ``Majoran'' one, owing to a leptonic asymmetry between the neutrino and ist antiparticle which arose at the grand-unified epoch. If μOn leave of absence from Université de Savoie, Chambéry, France.

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