Supersymmetric Dirac-Born-Infeld Axionic Inflation and Non-Gaussianity

Abstract

An analysis is given of inflation based on a supersymmetric Dirac-Born-Infeld (DBI) action in an axionic landscape. The DBI model we discuss involves a landscape of chiral superfields with one $U(1)$ shift symmetry which is broken by instanton type non-perturbative terms in the superpotential. Breaking of the shift symmetry leads to one pseudo-Nambu-Goldstone-boson which acts as the inflaton while the remaining normalized phases of the chiral fields generically labeled axions are invariant under the $U(1)$ shift symmetry. The analysis is carried out in the vacuum with stabilized saxions, which are the magnitudes of the chiral fields. Regions of the parameter space where slow-roll inflation occurs are exhibited and the spectral indices as well as the ratio of the tensor to the scalar power spectrum are computed. An interesting aspect of supersymmetric DBI models analyzed is that in most of the parameter space tensor to scalar ratio and scalar spectral index are consistent with Planck data if slow roll occurs and is not eternal. Also interesting is that the ratio of the tensor to the scalar power spectrum can be large and can lie close to the experimental upper limit and thus testable in improved experiment. Non-Gaussianity in this class of models is explored.

arXiv comment23 pages. 3 figures

References in corpus (46)

• de Sitter Vacua in String Theory
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Axion Cosmology
• k-Inflation
• Axions In String Theory
• Towards Inflation in String Theory
• Perturbations in k-inflation
• The Effective Field Theory of Inflation
• Acoustic Signatures in the Primary Microwave Background Bispectrum
• Systematics of Moduli Stabilisation in Calabi-Yau Flux Compactifications
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Adiabatic and entropy perturbations from inflation
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity
• Second-Order Cosmological Perturbations from Inflation
• The inflationary prediction for primordial non-gaussianity
• Natural Inflation: Particle Physics Models, Power Law Spectra for Large Scale Structure, and Constraints from COBE
• Completing Natural Inflation
• N-flation
• The shape of non-Gaussianities
• Assisted inflation
• Primordial non-gaussianities in single field inflation
• Limits on non-Gaussianities from WMAP data
• Large-scale structure, the cosmic microwave background, and primordial non-gaussianity
• Primordial non-gaussianities from multiple-field inflation
• On the Possibility of Large Axion Decay Constants
• On non-gaussianities in single-field inflation
• Racetrack Inflation
• Running Non-Gaussianities in DBI Inflation
• A review of Axion Inflation in the era of Planck
• Primordial fluctuations and non-Gaussianities in multi-field DBI inflation
• Pseudonatural Inflation
• Spinflation
• Born-Infeld action, supersymmetry and string theory
• Natural and Multi-Natural Inflation in Axion Landscape
• Axion Predictions in $SO(10)\times U(1{)}_{\mathrm{PQ}}$ Models
• Little Inflatons and Gauge Inflation
• Moduli Vacuum Misalignment and Precise Predictions in String Inflation
• Flux interactions on D-branes and instantons
• Axion Landscape and Natural Inflation
• Supergravity for Effective Theories
• Consistency relation for single scalar inflation
• Supersymmetric DBI inflation
• Deformation of Super Yang-Mills Theories in R-R 3-form Background
• Small field axion inflation with sub-Planckian decay constant
• Evidence for Inflation in an Axion Landscape
• More on DBI action in 4D $\mathcal{N}=1$ supergravity

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