Relic abundance of the neutralino in the grand unified theories coupled to N =1 supergravity

Journal Article · Sat Aug 15 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.1634· OSTI ID:7258656

Kawasaki, M ^[1]; Mizuta, S ^[2]

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1. Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)
2. Department of Physics, Tohoku University, Sendai 980 (Japan)

The relic abundance of the lightest neutralino is calculated in the scheme of grand unified theories (GUT's) coupled to {ital N}=1 supergravity. We take {ital m}{sub 3/2}, {ital M}{sub {ital g}{ital X}}, and {ital m}{sub {ital s}{ital X}} as free parameters, where {ital m}{sub 3/2} is the gravitino mass, {ital M}{sub {ital g}{ital X}} the universal gaugino mass at the GUT scale, and {ital m}{sub {ital s}{ital X}} 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.

• OSTI ID: 7258656
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:4; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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