Testing a Two Field Inflation Beyond the Slow-Roll Approximation
arXiv:1605.00823 · doi:10.1103/PhysRevD.93.103511
Abstract
We consider a model of two-field inflation, containing an ordinary scalar field and a DBI field. We work beyond the slow-roll approximation, but we assume a separable Hubble parameter. We then derive the form of potential in this framework and study the spectrum of the primordial perturbations in details. We also study the amplitude of the non-Gaussianity of the primordial perturbations both in equilateral and orthogonal configurations in this setup. We test the model with recent observational data and find some constraints on the model parameters. Our study shows that for some ranges of the DBI parameter, the model is consistent with observation and it is also possible to have large non-Gaussianity which would be observable by future improvements in experiments.
11 pages, 3 figures, Accepted for Publication in PRD
References in corpus (20)
- The Effective Field Theory of Inflation
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- Primordial Non-Gaussianities from Inflation Models
- The shape of primordial non-Gaussianity and the CMB bispectrum
- The Inflationary Trispectrum for Models with Large Non-Gaussianities
- Primordial fluctuations and non-Gaussianities in multi-field DBI inflation
- Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background
- Primordial non-Gaussianities in general modified gravitational models of inflation
- Hamilton-Jacobi method for Domain Walls and Cosmologies
- On the full quantum trispectrum in multi-field DBI inflation
- Some Aspects of Tachyon Field Cosmology
- Non-canonical generalizations of slow-roll inflation models
- DBI inflation with a non-minimally coupled Gauss-Bonnet term
- Separable and non-separable multi-field inflation and large non-Gaussianity
- Non-linear curvature perturbation in multi-field inflation models with non-minimal coupling
- Multi-Field Inflation on the Landscape
- Local non-Gaussianity from rapidly varying sound speeds
- Cosmological perturbations from multi-field inflation
- Non-Minimal Braneworld Inflation after the Planck
- The Non-Adiabatic Pressure Perturbation and Non-Canonical Kinetic Terms in Multifield Inflation