IR Inflation from Multiple Branes

Abstract

In this paper we examine the IR inflation scenario using the DBI action, where we have $N$ multiple branes located near the tip of a warped geometry. At large $N$ the solutions are similar in form to the more traditional single brane models, however we find that it is difficult to simultaneously satisfy the WMAP bounds on the scalar amplitude and the scalar spectral index. We go on to examine two new solutions where N=2 and N=3 respectively, which both have highly non-linear actions. The sound speed in both cases is dramatically different from previous works, and for the N=3 case it can actually be zero. We show that inflation is possible in both frameworks, and find that the scalar spectral index is bounded from above by unity. The level of non-gaussian fluctuations are smaller in the N=2 case compared to the single brane models, whilst those in the N=3 case are much larger.

Final Journal version

References in corpus (74)

• A Large Mass Hierarchy from a Small Extra Dimension
• An Alternative to Compactification
• de Sitter Vacua in String Theory
• k-Inflation
• Supergravity and a Confining Gauge Theory: Duality Cascades and $\chi$SB-Resolution of Naked Singularities
• Dielectric-Branes
• Towards Inflation in String Theory
• Perturbations in k-inflation
• DBI in the Sky
• Inflation Dynamics and Reheating
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Scalar Speed Limits and Cosmology: Acceleration from D-cceleration
• On non-abelian generalisation of Born-Infeld action in string theory
• Assisted inflation
• Brane/Flux Annihilation and the String Dual of a Non-Supersymmetric Field Theory
• Lectures on string/brane cosmology
• Gauge invariant MSSM inflaton
• Classical evolution and quantum generation in generalized gravity theories including string corrections and tachyon: Unified analyses
• On D3-brane Potentials in Compactifications with Fluxes and Wrapped D-branes
• Mirage Cosmology
• String Loop Corrections to Kahler Potentials in Orientifolds
• Loop Corrections to Volume Moduli and Inflation in String Theory
• Running Non-Gaussianities in DBI Inflation
• String Gas Cosmology
• The Noncommutative Bion Core
• Inflation from Warped Space
• Generalized Assisted Inflation
• Flux Stabilization of D-branes
• Multi-Throat Brane Inflation
• The Inflationary Trispectrum for Models with Large Non-Gaussianities
• Multiple Dp-branes in Weak Background Fields
• Random Matrices and the Spectrum of N-flation
• Cosmological perturbations in a generalized gravity including tachyonic condensation
• M-Theory Inflation from Multi M5-Brane Dynamics
• Dynamics of Assisted Inflation
• The Giant Inflaton
• On the Realization of Assisted Inflation
• Observing Brane Inflation
• Multiple D0-branes in Weakly Curved Backgrounds
• Non-gaussianity from the inflationary trispectrum
• Comparing Brane Inflation to WMAP
• DBI Inflation in the Tip Region of a Warped Throat
• Nflation: multi-field inflationary dynamics and perturbations
• Warped Reheating in Multi-Throat Brane Inflation
• Slow Roll Reconstruction: Constraints on Inflation from the 3 Year WMAP Dataset
• Nflation: non-gaussianity in the horizon-crossing approximation
• Heating in Brane Inflation and Hidden Dark Matter
• Bouncing Brane Cosmologies from Warped String Compactifications
• Multibrane Inflation and Dynamical Flattening of the Inflaton Potential
• Of pNGB QuiNtessence
• Inflation in large N limit of supersymmetric gauge theories
• Primordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory
• Lectures on string theory and cosmology
• Variations on the Warped Deformed Conifold
• On Perturbation Spectra of N-flation
• Nonabelian Phenomena on D-branes
• Is Brane Inflation Eternal?
• Observing the Geometry of Warped Compactification via Cosmic Inflation
• Cycling in the Throat
• Matrix Strings in Weakly Curved Background Fields
• Dynamics of Generalized Assisted Inflation
• On the Slow Roll Expansion for Brane Inflation
• Resolving brane collapse with 1/N corrections in non-Abelian DBI
• Cosmology of the Tachyon in Brane Inflation
• Slow Roll in Brane Inflation
• Inflation Assisted by Heterotic Axions
• Non-Abelian (p,q) Strings in the Warped Deformed Conifold
• Dielectric (p,q) Strings in a Throat
• Finite N effects on the collapse of fuzzy spheres
• DBI with Primordial Magnetic Field in the Sky
• Fuzzy Sphere Dynamics and Non-Abelian DBI in Curved Backgrounds
• Towards Quantum Dielectric Branes: Curvature Corrections in Abelian Beta Function and Nonabelian Born-Infeld Action
• Electrified Fuzzy Spheres and Funnels in Curved Backgrounds
• Instantons, Assisted Inflation and Heterotic M-theory

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• Primordial Non-Gaussianities from Inflation Models
• Route to nonlocal cosmology
• Spinflation
• Inflation with multiple sound speeds: a model of multiple DBI type actions and non-Gaussianities
• Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations
• Multifield DBI Inflation and Non-Gaussianities
• Energy Transfer in Multi Field Inflation and Cosmological Perturbations
• Modified Gravity Tomography
• Inflation from Wrapped Branes
• Generalised DBI-Quintessence
• N-flation from multiple DBI type actions
• A Consistency Relation for Power Law Inflation in DBI models
• Supersymmetric DBI inflation
• DBI N-flation
• Fine-Tuning in DBI Inflationary Mechanism
• Single-Field Inflation After WMAP5
• Quintessence and phantom dark energy from ghost D-branes
• Gravitational Wave Constraints on Multi-Brane Inflation
• Inflation in a Web
• Inflation in DBI models with constant gamma
• Fields Annihilation and Particles Creation in DBI inflation
• Dynamics of D3-D7 Brane Inflation in Throats
• Reconstructing Single Field Inflationary Actions From CMBR Data
• Dynamics of Cosmological Perturbations in Multi-Speed Inflation
• An update on single field models of inflation in light of WMAP7
• Spectrum of Curvature Perturbation of Multi-field Inflation with Small-Field Potential
• Cosmological Perturbations in Inflationary Models with Anisotropic Space-Time Scaling in Lifshitz Background
• Cosmic evolution of scalar fields with multiple vacua: generalized DBI and quintessence