Natural Chaotic Inflation in Supergravity and Leptogenesis

Abstract

We comprehensively investigate a chaotic inflation model proposed recently in the framework of supergravity. In this model, the form of Kähler 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.

16 pages. To appear in Phys. Rev. D

References in corpus (9)

• Natural Chaotic Inflation in Supergravity
• Production of Massive Fermions at Preheating and Leptogenesis
• Leptogenesis in Inflaton Decay
• Gravitino Production After Inflation
• Leptogenesis in Inflationary Universe
• Superconformal Symmetry, Supergravity and Cosmology
• Thermal and Non-Thermal Production of Gravitinos in the Early Universe
• Non-Thermal Production of Dangerous Relics in the Early Universe
• Matter Antimatter Asymmetry and Neutrino Properties

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