New constraints on ``INO'' masses from cosmology (I). Supersymmetric ``inos''

Details New constraints on ``INO'' masses from cosmology (I). Supersymmetric ``inos'' New constraints on ``INO'' masses from cosmology (I). Supersymmetric ``inos''

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983nuphb.227..556k&link_type=abstract

Nuclear Physics B, Volume 227, Issue 3, p. 556-569.

Physics

Nuclear Physics

166

Scientific paper

In this first paper we derive new constraints on gravitino and photino masses in big bang cosmology. First, in the context of induced supersymmetry breaking we calculate explicitly the gravitino decay rate into gauginos, and find that in the absence of significant dilution the gravitino mass must be >=5 × 104 GeV in order not to affect nucleosynthesis. We also find in this case that constraints in the lightest R-odd particle, the photino, differ significantly from earlier bounds based on analogy with stable heavy neutrino bounds in the standard model, due to out of equilibrium gravitino decay. In order to avoid both these constraints the gravitino distribution must be severely suppressed. If this is due to inflation, it must occur at a scale <~1010-1011 GeV.
Junior Fellow, Harvard society of Fellows.

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