Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-08
Phys.Rev. D69 (2004) 015006
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, including 1 tables and 7 figures
Scientific paper
10.1103/PhysRevD.69.015006
We show that a mini-thermal inflation occurs naturally in a class of gauge mediation models of supersymmetry (SUSY) breaking, provided that the reheating temperature T_R of the primary inflation is much higher than the SUSY-breaking scale, say T_R > 10^{10} GeV. The reheating process of the thermal inflation produces an amount of entropy, which dilutes the number density of relic gravitinos. This dilution renders the gravitino to be the dark matter in the present universe. The abundance of the gravitinos is independent of the reheating temperature T_R, once the gravtinos are thermally produced after the reheating of the primary inflation. We find that the thermal leptogenesis takes place at T_L\simeq 10^{12-14} GeV for m_{3/2}\simeq 100 keV - 10 MeV without any gravitino problem.
Fujii Masaaki
Ibe Masahiro
Yanagida Takayuki
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