Volume modulus inflation and a low scale of SUSY breaking

Journal Article · Tue Jul 15 04:00:00 EDT 2008 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2008/07/021· OSTI ID:22156691

Badziak, Marcin; Olechowski, Marek ^[1]

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1. Institute of Theoretical Physics, University of Warsaw, ul. Hoza 69, PL-00-681 Warsaw (Poland)

The relation between the Hubble constant and the scale of supersymmetry breaking is investigated in models of inflation dominated by a string modulus. Usually in this kind of model the gravitino mass is of the same order of magnitude as the Hubble constant, which is not desirable from the phenomenological point of view. It is shown that slow-roll saddle point inflation may be compatible with a low scale of supersymmetry breaking only if some corrections to the lowest-order Kaehler potential are taken into account. However, choosing an appropriate Kaehler potential is not enough. There are also conditions for the superpotential and, for example, the popular racetrack superpotential turns out to be not suitable. A model is proposed in which slow-roll inflation and a light gravitino are compatible. It is based on a superpotential with a triple gaugino condensation and the Kaehler potential with the leading string corrections. The problem of fine-tuning and experimental constraints are discussed for that model.

• OSTI ID: 22156691
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 07 Vol. 2008; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
HUBBLE EFFECT
INFLATIONARY UNIVERSE
LIMITING VALUES
MASS
STRING MODELS
SUPERSYMMETRY
SYMMETRY BREAKING