Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-07-20
Phys.Rev.D73:123511,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages, 11 figures
Scientific paper
10.1103/PhysRevD.73.123511
We study the effects of the unstable gravitino on the big-bang nucleosynthesis. If the gravitino mass is smaller than \sim 10 TeV, primordial gravitinos produced after the inflation are likely to decay after the big-bang nucleosynthesis starts, and the light element abundances may be significantly affected by the hadro- and photo-dissociation processes as well as by the p n conversion process. We calculate the light element abundances and derived upper bound on the reheating temperature after the inflation. In our analysis, we calculate the decay parameters of the gravitino (i.e., lifetime and branching ratios) in detail. In addition, we performed a systematic study of the hadron spectrum produced by the gravitino decay, taking account of all the hadrons produced by the decay products of the gravitino (including the daughter superparticles). We discuss the model-dependence of the upper bound on the reheating temperature.
Kohri Kazunori
Moroi Takeo
Yotsuyanagi Akira
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