Gravitino Production in the Early Universe and Its Implications to Particle Cosmology
- Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
Effects of the unstable gravitino on the big-bang nucleosynthesis (BBN) and its implications to particle cosmology are discussed. If the gravitino mass is smaller than {approx} 20 TeV, lifetime of the gravitino becomes longer than {approx} 1 sec and its decay may spoil the success of the standard BBN. In order to avoid such a problem, upper bound on the reheating temperature after the inflation is obtained, which may be as low as {approx} 105-6 GeV. For a successful baryogenesis with such low reheating temperature, a consistent scenario based on the large cutoff supergravity (LCSUGRA) hypothesis of supersymmetry breaking, where the gravitino and sfermion become as heavy as {approx} O(1 - 10 TeV), is proposed. In the LCSUGRA, non-thermal leptogenesis can produce large enough baryon asymmetry. We also see that, in the LCSUGRA scenario, relic density of the lightest superparticle becomes consistent with the WMAP value of the dark matter density in the parameter region required for the successful non-thermal leptogenesis. In this case, the dark matter density may be reconstructed with the future e+e- linear collider.
- OSTI ID:
- 20729196
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 805; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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