Cosmological gravitino problem in gauge-mediated supersymmetry breaking models

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書誌事項

公開日
2000-09
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/s0370-2693(00)00959-x
  • 10.48550/arxiv.hep-ph/0005136
公開者
Elsevier BV

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説明

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.

15 pages, 3 eps figures; reviced version to be published in Physics Letters B

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