F-Term Hybrid Inflation, the η-problem and Extra Dimensions
arXiv:hep-ph/0201016 · doi:10.1088/1126-6708/2002/12/029
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 η-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 ηproblem. 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
11 pages LaTeX. Correction to review discussion. Results unchanged
References in corpus (6)
- DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum
- Cardassian Expansion: a Model in which the Universe is Flat, Matter Dominated, and Accelerating
- Cosmological Parameter Extraction from the First Season of Observations with DASI
- Experiment Design and First Season Observations with the Degree Angular Scale Interferometer
- N=1 Supergravity Chaotic Inflation in the Braneworld Scenario
- Order rho^2 Corrections to Randall-Sundrum I Cosmology