Gravitino Production in the Early Universe and Its Implications to Particle Cosmology

Abstract

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.

Talk given at PASCOS05, Gyeongju, Korea (June 2005). 13 pages, 5 figures

References in corpus (3)

• Big-Bang Nucleosynthesis with Unstable Gravitino and Upper Bound on the Reheating Temperature
• Dark Matter and Baryon Asymmetry of the Universe in Large-Cutoff Supergravity
• Reconstructing Dark Matter Density with e^+e^- Linear Collider in Focus-Point Supersymmetry

Cited by in corpus (10)

• Leptogenesis and Low Energy CP Violation in Neutrino Physics
• Successful type I Leptogenesis with SO(10)-inspired mass relations
• On Resonant Leptogenesis
• Quantum Resonant Leptogenesis and Minimal Lepton Flavour Violation
• Thermal leptogenesis in a TeV scale model for neutrino masses
• A direct link between neutrinoless double beta decay and leptogenesis in a seesaw model with $S_4$ symmetry
• Supersymmetric Leptogenesis and the Gravitino Bound
• Extension of a radiative neutrino mass model based on a cosmological view point
• Observable Electron EDM and Leptogenesis
• Gravitino Thermal Production, Dark Matter, and Reheating of the Universe