Primordial gravitational wave of BICEP2 from dynamical double hybrid inflation
arXiv:1404.3756 · doi:10.1016/j.physletb.2014.06.053
Abstract
BICEP2 has observed a primordial gravitational wave corresponding to the tensor-to-scalar ratio of 0.16. It seems to require a super-Planckian inflationary model. In this paper, we propose a double hybrid inflation model, where the inflaton potential dynamically changes with the evolution of the inflaton fields. During the first phase of inflation over 7 e-folds, the power spectrum can be almost constant by a large linear term in the hybrid potential, which is responsible also for the large tensor-to-scalar ratio. In the second phase of 50 e-folds, the dominant potential becomes dynamically changed to the logarithmic form as in the ordinary supersymmetric hybrid inflation, which is performed by the second inflaton field. In this model, the sub-Planckian field values (~0.9 M_P) can still yield the correct cosmic observations with the sufficient e-folds.
12 pages, 1 figure, version to appear in Phys. Lett. B
References in corpus (14)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Non-Gaussianities in two-field inflation
- Multi-brid inflation and non-Gaussianity
- Multiple field inflation
- More hilltop inflation models
- Large non-Gaussianity from multi-brid inflation
- Hybrid inflation along waterfall trajectories
- Nflation: multi-field inflationary dynamics and perturbations
- Generating the Curvature Perturbation at the End of Inflation in String Theory
- Observable Gravity Waves from Supersymmetric Hybrid Inflation II
- The Trispectrum in the Multi-brid Inflation
- Observable Gravity Waves From Supersymmetric Hybrid Inflation
- Kaehler Potentials for Hilltop F-term Hybrid Inflation
- Evolution of the curvature perturbation during and after multi-field inflation