F-term Hybrid Inflation, the η-problem and Extra Dimensions


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
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
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