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 (39)
- Large N Field Theories, String Theory and Gravity
- Dielectric-Branes
- Generating the curvature perturbation without an inflaton
- Towards Inflation in String Theory
- Rolling Tachyon
- Perturbations in k-inflation
- DBI in the Sky
- Tachyon Matter
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
- Brane Inflation
- Adiabatic CMB perturbations in pre-big bang string cosmology
- Effects of Cosmological Moduli Fields on Cosmic Microwave Background
- A general proof of the conservation of the curvature perturbation
- Scalar Speed Limits and Cosmology: Acceleration from D-cceleration
- The primordial density perturbation in the curvaton scenario
- Nongaussian Isocurvature Perturbations from Inflation
- The inflationary prediction for primordial non-gaussianity
- Super-Horizon Scale Dynamics of Multi-Scalar Inflation
- Perturbations in generalized multi-field inflation
- Inflation from Warped Space
- Non-gaussianity from the second-order cosmological perturbation
- Curvaton Reheating in Non-oscillatory Inflationary Models
- Spinflation
- Reheating from Tachyon Condensation
- MSSM flat direction as a curvaton
- The CDM isocurvature perturbation in the curvaton scenario
- The curvaton scenario in supersymmetric theories
- Multifield DBI Inflation and Non-Gaussianities
- Rolling Tachyon in Brane World Cosmology from Superstring Field Theory
- The Peccei-Quinn Field as Curvaton
- Curvaton reheating: an application to braneworld inflation
- Heating in Brane Inflation and Hidden Dark Matter
- Curvaton and QCD Axion in Supersymmetric Theories
- Cycling in the Throat
- Modular inflation and the orthogonal axion as curvaton
- 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 (48)
- Quasi-Single Field Inflation and Non-Gaussianities
- Particle physics models of inflation and curvaton scenarios
- Primordial non-Gaussianities in general modified gravitational models of inflation
- Inflation with multiple sound speeds: a model of multiple DBI type actions and non-Gaussianities
- Curvaton with Polynomial Potential
- Evolution of Metric Perturbations in Quintom Bounce model
- On the full trispectrum in single field DBI-inflation
- On Classification of Models of Large Local-Type Non-Gaussianity
- Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
- Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
- A geometric description of the non-Gaussianity generated at the end of multi-field inflation
- Primordial perturbation with a modified dispersion relation
- On the full quantum trispectrum in multi-field DBI inflation
- The Curvature Perturbation in the Axion-type Curvaton Model
- Dirac-Born-Infeld realization of sound speed resonance mechanism for primordial black holes
- 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
- Curvaton with nonminimal derivative coupling to gravity
- N-vaton
- Multi-Stream Inflation
- Negative spectral index of in the axion-type curvaton model
- Trispectrum from Ghost Inflation
- On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll
- Non-Gaussianities of Single Field Inflation with Non-minimal Coupling
- Large Nonlocal Non-Gaussianity from a Curvaton Brane
- Curvaton with Nonminimal Derivative Coupling to Gravity II: Full Perturbation Analysis
- Spectral Index in Curvaton Scenario
- Thermodynamics of Spinor Quintom
- Non-Gaussianity from Lifshitz Scalar
- Rotating a Curvaton Brane in a Warped Throat
- Numerical study of inflationary preheating with arbitrary power-law potential and a realization of curvaton mechanism
- Spinflation with Angular Potentials
- Non-Gaussianity with Lagrange Multiplier Field in the Curvaton Scenario
- Modulated reheating by curvaton
- On primordial trispectrum from exchanging scalar modes in general multiple field inflationary models
- Scale-dependent CMB power asymmetry from primordial speed of sound and a generalized N formalism
- Dynamics of Cosmological Perturbations in Multi-Speed Inflation
- Revised parameter in Curvaton Scenario
- 1/R Correction to Gravity in the Early Universe
- Reconstruction of the isocurvaton scenario
- Scale dependences of local form non-Gaussianity parameters from a DBI isocurvature field
- Multi-scalar tachyon potential on non-BPS domain walls
- A BRST Characterization of the Broken Phase Observables of the Confining Complex Theory
- Where does curvaton reside? Differences between bulk and brane frames
- Spectator fields and their imprints on the Cosmic Microwave Background
- Inhomogeneous Reheating Scenario with DBI fields