Constraints on light particles from supernova SN 1987A

Details Constraints on light particles from supernova SN 1987A Constraints on light particles from supernova SN 1987A

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phlb..193..525e&link_type=abstract

Physics Letters B, Volume 193, Issue 4, p. 525-530.

Physics

76

Scientific paper

We show how the recent observations of neutrinos from SN 1987A can be used to constrain the properties of light particles, including the number of neutrino species Nv and the coupling strength of a light pseudoscalar boson such as the axion. First we demonstrate the consistency of Kamiokande II and IMB III data with each other and with the standard theory of neutrino emission from a supernova core of radius R≅20 km and effective temperature T≅5 to 6 MeV. The total amount of energy emission by neutrinos is compatble with the binding energy of a neutron star only if Nv<=6. The upper limit on the difference between the binding energy and the energy lost via Nv = 3 neutrino species excludes light pseudoscalar bosons with couplings to electrons in the range 10-27<=αe<=10-24, which enables one to extend astrophysical bounds on the axion decay constant to ƒ;a>=4×109 GeV.

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