Big-bang nucleosynthesis and gravitinos

Journal Article · Mon Sep 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.065011· OSTI ID:21254165

Kawasaki, Masahiro ^[1]; Kohri, Kazunori ^[2]; Moroi, Takeo; Yotsuyanagi, Akira ^[3]

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1. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582 (Japan)
2. Physics Department, Lancaster University, Lancaster LA1 4YB (United Kingdom)
3. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

We derive big-bang nucleosynthesis (BBN) constraints on both unstable and stable gravitino taking account of recent progress 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 B-ino, 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.

• OSTI ID: 21254165
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOLTZMANN EQUATION
BOUND STATE
ELEMENT ABUNDANCE
GRAVITONS
NUCLEOSYNTHESIS
PARTICLES
SCATTERING
SPARTICLES