Mathematics – Logic
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..46.1634k&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 46, Issue 4, 15 August 1992, pp.1634-1642
Mathematics
Logic
11
Supergravity, Supersymmetry, Supersymmetric Partners Of Known Particles
Scientific paper
The relic abundance of the lightest neutralino is calculated in the scheme of grand unified theories (GUT's) coupled to N=1 supergravity. We take m3/2, MgX, and msX as free parameters, where m3/2 is the gravitino mass, MgX the universal gaugino mass at the GUT scale, and msX the supersymmetric Higgs-boson mass at that scale. Even after we impose the experimental and cosmological constraints, it is found that there remains some supersymmetric parameter region and the lightest neutralino with a mass below about 500 GeV can be the dark matter of the Universe. In particular, the abundance of the neutralino can amount to the critical density of the Universe and is consistent with the inflationary universe scenario which naturally solves the ``gravitino problem'' in supergravity theories.
Kawasaki Masahiro
Mizuta Satoshi
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