Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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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 -