Constraint on the gravitino mass in hybrid inflation

Journal Article · Wed Dec 01 00:00:00 EST 2010 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2010/12/010· OSTI ID:22275408

Nakayama, Kazunori ^[1]; Takahashi, Fuminobu

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1. Theory Center, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)

We revisit the F-term hybrid inflation model in supergravity. In particular, we point out that a constant term in the superpotential has significant effects on the inflaton dynamics. It is shown that the hybrid inflation model suffers from several potential problems: tuning of the initial condition, gravitino overproduction and formation of cosmic strings, for both minimal and non-minimal Kähler potentials. These problems can only be avoided in gauge-mediated SUSY breaking models where the gravitino is relatively light and the constant term in the superpotential is not important. Implications on the non-thermal leptogenesis scenario are also described.

• OSTI ID: 22275408
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
COSMOLOGY
GRAVITONS
INFLATIONARY UNIVERSE
INFLATONS
LIMITING VALUES
MASS
PARTICLE PRODUCTION
POTENTIALS
STRING MODELS
SUPERGRAVITY
SUPERSYMMETRY
SYMMETRY BREAKING
VISIBLE RADIATION