Cosmic neutrino radiation in the far ultraviolet and the E6 model

Details Cosmic neutrino radiation in the far ultraviolet and the E6 model Cosmic neutrino radiation in the far ultraviolet and the E6 model

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phlb..263..437m&link_type=abstract

Physics Letters B, Volume 263, Issue 3-4, p. 437-440.

Physics

3

Scientific paper

Observations of the cosmic ultraviolet background by the Berkeley UVX spectrometer sets an upper limit to the intensity of radiation due to possibly existing radiatively decaying primordial particles in the mass range 13.5-17.5 eV. If such particles exist with a number density equalling that of neutrinos today they must have a lifetime exceeding 4.6×1023s. We explore the idea of Sciama that tau neutrinos ντ of mass 29+/-1 eV with a lifetime of (2+/-1)×1023 s decay radiatively into αμ or αe thereby being responsible for the ionization of interstellar and intergalactic hydrogen (the Gunn-Petersen effect). In the standard model this is impossible; however, in the context of an E6 model the neutrinos may have radiative lifetimes of the order of 10103 s.

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