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• W1992392009 abstract "We investigate the cosmological gravitino problem in gauge-mediated supersymmetry breaking models, where the gravitino becomes in general the lightest supersymmetric particle (LSP). In order to avoid the overclosure of the stable gravitino, the reheating temperature of inflation $T_R$ should be low enough. Furthermore, if the gravitino mass is larger than about 100 MeV, the decay of the next-to-LSP (NLSP) into the gravitino may modify disastrously the abundances of the light elements predicted by the big-bang nucleosynthesis (BBN). We consider the case in which the lighter stau is the NLSP and derive cosmological constraints from the BBN on the stau NLSP decay. We obtain a lower bound on the mass of stau $m_{staul}$, which is more stringent than the current experimental limit $m_{staul} > 90$ GeV for the gravitino mass region $m_{3/2} gsim 5$ GeV. This lower bound, together with the overclosure constraint on the stable gravitino, gives an upper bound on $T_{R}$. We find that the reheating temperature can be as high as $10^9$--$10^{10}$ GeV for $m_{3/2} simeq 5$--100 GeV." @default.
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• W1992392009 title "Cosmological gravitino problem in gauge-mediated supersymmetry breaking models" @default.
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• W1992392009 doi "https://doi.org/10.1016/s0370-2693(00)00959-x" @default.
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