Big-Bang Nucleosynthesis and Gravitino

Abstract

We derive big-bang nucleosynthesis (BBN) constraints on both unstable and stable gravitino taking account of recent progresses in theoretical study of the BBN processes as well as observations of primordial light-element abundances. In the case of unstable gravitino, we set the upper limit on the reheating temperature assuming that the primordial gravitinos are mainly produced by the scattering processes of thermal particles. For stable gravitino, we consider Bino, stau and sneutrino as the next-to-the-lightest supersymmetric particle and obtain constraints on their properties. Compared with the previous works, we improved the following points: (i) we use the most recent observational data, (ii) for gravitino production, we include contribution of the longitudinal component, and (iii) for the case with unstable long-lived stau, we estimate the bound-state effect of stau accurately by solving the Boltzmann equation.

27 pages, 16 figures

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• Entropy production by Q-ball decay for diluting long-lived charged particles
• Solving the discrepancy among the light elements abundances and WMAP
• The Gravitino-Stau Scenario after Catalyzed BBN
• Constraints on Gravitino Dark Matter Scenarios with Long-Lived Charged Sleptons
• Bridging the primordial A=8 divide with Catalyzed Big Bang Nucleosynthesis
• Extremely Long-Lived Charged Massive Particles as A Probe for Reheating of the Universe
• Gravitino dark matter from increased thermal relic particles
• Flaxino dark matter and stau decay

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• Theoretical expectations for dark matter detection at the LHC
• Gravitino Production after Inflation in No-Scale Supergravity
• Completing RHINO
• Heavy Gravitino from Dynamical Generation of Right-Handed Neutrino Mass Scale, and Gravitational Waves
• Thermal leptogenesis in the presence of helical hypermagnetic fields
• Supersymmetry Breaking and Gravitino Production after Inflation in Modular Invariant Supergravity
• Parametric Coincidence in the Baryon to Dark Matter Ratio from Affleck-Dine Baryogenesis and UV Freeze-in Dark Matter
• A cross-epoch endpoint-consistency test of a single effective scaling from dark energy to inflation
• No-scale gauge non-singlet inflation inducing TeV scale inverse seesaw mechanism
• Gravitino thermal production
• Indirect Probes of Supersymmetry Breaking in the JEM-EUSO Observatory