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Science 14 December 1990:
Vol. 250. no. 4987, pp. 1529 - 1533
DOI: 10.1126/science.250.4987.1529
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Articles

Astrophysics and Cosmology Closing in on Neutrino Masses

Arnon Dar 1

1 Department of Physics and Space Research Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel

Massive neutrinos are expected in most grand unified theories that attempt to unify the strong and electroweak interactions. So far, heroic laboratory experiments have yielded only upper bounds on the masses of the elusive neutrinos. These bounds, however, are not very restrictive and cannot even exclude the possibility that the dark matter in the universe consists of neutrinos. The astrophysical and cosmological bounds on the masses of the muon and tau neutrinos, mvvµ and mvvtgr, which already are much more restrictive than the laboratory bounds, and the laboratory bound on the mass of the electron neutrino, mvvc, can be improved significantly by future astrophysical and cosmological observations that perhaps will pin down the neutrino masses. Indeed, the recent results from the solar neutrino experiments combined with the seesaw mechanism for generating neutrino masses suggest that mvvc sim 10-8 electron volts, mvvµ sim 10-3 electron volts, and mvvtgr sim 10 electron volts, which can be tested in the near future by solar neutrino and accelerator experiments.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)