Dirac neutrinos and SN 1987A

Details Dirac neutrinos and SN 1987A Dirac neutrinos and SN 1987A

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991dns..book.....t&link_type=abstract

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Physics

Cooling, Neutrinos, Particle Mass, Stellar Models, Stellar Radiation, Stellar Temperature, Supernova 1987A, Eigenvectors, Neutron Stars, Pair Production, Stellar Evolution

Scientific paper

Previous work has shown that the cooling of SN 1987A excludes a Dirac-neutrino mass greater than theta(20 keV) for nu(sub e), nu(sub mu), or nu(sub tau). The emission of wrong-helicity, Dirac neutrinos from SN 1987A, is re-examined. It is concluded that the effect of a Dirac neutrino on the cooling of SN 1987A has been underestimated due to neutrino degeneracy and additional emission processes. The limit that follows from the cooling of SN 1987A is believed to be greater (probably much greater) than 10 keV. This result is significant in light of the recent evidence for a 17 keV mass eigenstate that mixes with the electron neutrino.

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