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

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F-term Hybrid Inflation, the η-problem and Extra Dimensions. / McDonald, John.
In: Journal of High Energy Physics, Vol. 2002, No. 12, 029, 16.01.2003.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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McDonald J. F-term Hybrid Inflation, the η-problem and Extra Dimensions. Journal of High Energy Physics. 2003 Jan 16;2002(12):029. doi: 10.1088/1126-6708/2002/12/029

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McDonald, John. / F-term Hybrid Inflation, the η-problem and Extra Dimensions. In: Journal of High Energy Physics. 2003 ; Vol. 2002, No. 12.

Bibtex

@article{77b7f6f74d9944fdbe28548d35a11f4b,
title = "F-term Hybrid Inflation, the η-problem and Extra Dimensions",
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.",
keywords = "Extra large dimensions, Supergravity models, Physics of the early universe",
author = "John McDonald",
year = "2003",
month = jan,
day = "16",
doi = "10.1088/1126-6708/2002/12/029",
language = "English",
volume = "2002",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer-Verlag",
number = "12",

}

RIS

TY - JOUR

T1 - F-term Hybrid Inflation, the η-problem and Extra Dimensions

AU - McDonald, John

PY - 2003/1/16

Y1 - 2003/1/16

N2 - 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.

AB - 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.

KW - Extra large dimensions

KW - Supergravity models

KW - Physics of the early universe

U2 - 10.1088/1126-6708/2002/12/029

DO - 10.1088/1126-6708/2002/12/029

M3 - Journal article

VL - 2002

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 12

M1 - 029

ER -