Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-09-13
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given at PASCOS05, Gyeongju, Korea (June 2005). 13 pages, 5 figures
Scientific paper
10.1063/1.2149673
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 \sim 20 TeV, lifetime of the gravitino becomes longer than \sim 1sec 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 \sim 10^{5-6} GeV. For a successful baryogenesis with such low reheating temeprature, a consistent scenario based on the large cutoff supergravity (LCSUGRA) hypothesis of supersymmetry breaking, where the gravitino and sfermion become as heavy as \sim 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.
No associations
LandOfFree
Gravitino Production in the Early Universe and Its Implications to Particle Cosmology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Gravitino Production in the Early Universe and Its Implications to Particle Cosmology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gravitino Production in the Early Universe and Its Implications to Particle Cosmology will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-703741