Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-11-08
Phys.Rev. D63 (2001) 103514
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages. To appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.63.103514
We comprehensively investigate a chaotic inflation model proposed recently in the framework of supergravity. In this model, the form of K\"ahler potential is determined by a symmetry, that is, the Nambu-Goldstone-like shift symmetry, which guarantees the absence of the exponential factor in the potential for the inflaton field. Though we need the introduction of small parameters, the smallness of the parameters is justified also by symmetries. That is, the zero limit of the small parameters recovers symmetries, which is natural in the 't Hooft's sense. The leptogenesis scenario via the inflaton decay in this chaotic inflation model is also discussed. We find that the lepton asymmetry enough to explain the present baryon number density is produced for low reheating temperatures avoiding the overproduction of gravitinos.
Kawasaki Masahiro
Yamaguchi Masahide
Yanagida Takayuki
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