Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-23
Phys.Rev.D78:065011,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 16 figures
Scientific paper
10.1103/PhysRevD.78.065011
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.
Kawasaki Masahiro
Kohri Kazunori
Moroi Takeo
Yotsuyanagi Akira
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