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F-Term Hybrid Inflation, the eta-problem and Extra Dimensions | | John McDonald
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4 Dec 2001 | | Journal: | JHEP 0212 (2002) 029 | | Subject: | hep-ph astro-ph | | Affiliation: | Liverpool | | Abstract: | F-term hybrid inflation models in the context of supergravity generically have corrections to the inflaton mass squared of the order of H^{2} (the eta-problem). In addition they have a problem with large deviations of the spectrum of density perturbations from scale-invariance due to non-renormalizable corrections to the superpotential. Here we show that an increase of the expansion rate at large energy densities relative to that in conventional d=4 cosmology, as suggested by the single brane Randall-Sundrum scenario with an uncompactified extra dimension, can naturally solve the eta problem. This requires that the d=5 Planck mass satisfies M_{5} < 10^{16} GeV. In addition, the scale-invariance of the density perturbation spectrum can be generally protected from Planck-suppressed superpotential corrections if M_{5} < 10^{10} GeV | | Source: | arXiv, hep-ph/0201016 | | Services: | Forum | Review | PDF | Favorites | |
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