Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-03-21
JCAP 0506 (2005) 005
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 2 figures; the version to appear in JCAP
Scientific paper
10.1088/1475-7516/2005/06/005
The gravitino problem gives a severe constraint on the thermal leptogenesis scenario. This problem leads us to consider some alternatives to it if we try to keep the gravitino mass around the weak scale $m_{3/2} \sim 100$ GeV. We consider, in this paper, the non-thermal leptogenesis scenario in the framework of a minimal supersymmetric SO(10) model. Even if we start with the same minimal SO(10) model, we have different predictions for low-energy phenomenologies dependent on the types of seesaw mechanism. This is the case for leptogenesis: it is shown that the type-I see-saw model gives a consistent scenario for the non-thermal leptogenesis but not for type-II. The predicted inflaton mass needed to produce the observed baryon asymmetry of the universe is found to be $M_I \sim 5 \times 10^{11}$ GeV for the reheating temperature $T_R = 10^6$ GeV.
Fukuyama Takeshi
Kikuchi Tatsuru
Osaka Toshiyuki
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