Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..45.3312b&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 45, Issue 10, 15 May 1992, pp.R3312-R3315
Physics
10
Scientific paper
If the right-handed singlet components (νR) of Dirac neutrinos participate in an interaction with quarks via the exchange of scalar leptoquarks, Supernova 1987A constraints on their masses can be evaded without running into gross conflict with nucleosynthesis results on the number of allowed neutrino species. Owing to an approximate SU(3)-flavor symmetry of the effective νR-quark four-fermion interaction, the νR's freeze out sufficiently early from the hadronic matter (π+/-, K+/-, nucleons, etc.) during the evolution of the Universe, contributing effectively as 0.5 of a neutrino species to nucleosynthesis, and yet are trapped inside the supernova core via their interaction with the nucleons.
Babu K. S.
Mohapatra Rabindra N.
Rothstein Ira Z.
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