Spectral Index and Non-Gaussianity in Supersymmetric Hybrid Inflation
arXiv:0910.4092 · doi:10.1140/epjc/s10052-012-1857-9
Abstract
We consider a supersymmetric hybrid inflation model with two inflaton fields. The superpotential during inflation is dominated by W=(κS+κ' S')M^2, where S, S' are inflatons carrying the same U(1)_R charge, κ, κ' are dimensionless couplings, and M (\sim 10^{15-16} GeV) is a dimensionful parameter associated with a symmetry breaking scale. One light mass eigenstate drives inflation, while the other heavier mass eigenstate is stuck to the origin. The smallness of the lighter inflaton mass for the scalar spectral index n_s\approx 0.96, which is the center value of WMAP7, can be controlled by the ratio κ'/κthrough the supergravity corrections. We also discuss the possibility of the two field inflation and large non-Gaussianity in this setup.
17 pages, 2 figures, version published in Eur. Phys. J. C
References in corpus (10)
- Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Curvature and isocurvature perturbations in two-field inflation
- Review of local non-Gaussianity from multi-field inflation
- Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential
- More hilltop inflation models
- Large non-Gaussianity from multi-brid inflation
- Supersymmetric Hybrid Inflation Redux
- Supersymmetric And Smooth Hybrid Inflation In The Light Of WMAP3
- Kaehler Potentials for Hilltop F-term Hybrid Inflation
- Natural Hybrid Inflation Model with Large Non-Gaussianity