McDonald, John
(2002)
F-term Hybrid Inflation, the η-problem and Extra Dimensions.
Journal of High Energy Physics, 2002 (12).
029-029.
ISSN 1029-8479, 1029-8479
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Abstract
F-term hybrid inflation models in the context of supergravity generically have corrections to the inflaton mass squared of the order of H2 (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 brane scenarios, can naturally solve the η problem. For the case of a ρ2 squared correction to H2 suppressed by the brane tension this requires that the d = 5 Planck mass satisfies M51016 GeV. In addition, the scale-invariance of the density perturbation spectrum can be generally protected from Planck-suppressed superpotential corrections if M51010{ GeV}. Therefore brane cosmologies which produce an enhanced expansion rate at large energy densities are favoured by SUSY hybrid inflation.
Item Type: | Article |
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Additional Information: | LTH 532. arXiv Number: arXiv:hep-ph/0201016v6. 10 pages. Published 16 January 2003. Issue: December 2002. |
Uncontrolled Keywords: | extra large dimensions, supergravity models, physics of the early universe, SUPERSTRING MODELS, ENTROPY CRISIS, GRAVITY, BREAKING, PHENOMENOLOGY, SUPERSYMMETRY, MILLIMETER, DIRECTIONS, HIERARCHY, COSMOLOGY |
Subjects: | ?? QC ?? |
Divisions: | Faculty of Science and Engineering > School of Physical Sciences > Mathematical Sciences |
Depositing User: | Symplectic Admin |
Date Deposited: | 14 Apr 2009 11:18 |
Last Modified: | 24 May 2025 04:02 |
DOI: | 10.1088/1126-6708/2002/12/029 |
Related Websites: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/553 |