DBI-Curvaton
arXiv:0806.2363 · doi:10.1016/j.physletb.2008.12.056
Abstract
In this paper, we study a curvaton model described by a Dirac-Born-Infeld-like action. We calculate the spectrum of curvature perturbation induced by DBI-curvaton and estimate its non-Gaussianity. We find that in the limit of low sound speed the amplitude of curvature perturbation is enhanced more than that in DBI inflation. This result also means that the inflationary scale with DBI-curvaton may be lower than that in usual curvaton model. In addition, we also find that the local non-Gaussianity level in DBI-curvaton is generally about 10 times larger than that in usual curvaton model, which is interesting for current observations. This work in some sense explores a new application of brane-cosmology in inflation.
7 pages, several references added
References in corpus (9)
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- Perturbations in generalized multi-field inflation
- Non-gaussianity from the second-order cosmological perturbation
- Spinflation
- Multifield DBI Inflation and Non-Gaussianities
- Heating in Brane Inflation and Hidden Dark Matter
- DBI Inflation using a One-Parameter Family of Throat Geometries
- Curvaton reheating mechanism in inflation on warped Dvali-Gabadadze-Porrati brane
- Curvaton Dynamics in Brane-worlds
Cited by in corpus (11)
- Evolution of Metric Perturbations in Quintom Bounce model
- Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
- Primordial perturbation with a modified dispersion relation
- On the full quantum trispectrum in multi-field DBI inflation
- Lorentz boost and non-Gaussianity in multi-field DBI-inflation
- N-flation from multiple DBI type actions
- Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
- The Trispectrum in the Multi-brid Inflation
- N-vaton
- Spectral Index in Curvaton Scenario
- Reconstruction of the isocurvaton scenario