Cosmology of the Tachyon in Brane Inflation

Abstract

In certain implementations of the brane inflationary paradigm, the exit from inflation occurs when the branes annihilate through tachyon condensation. We investigate various cosmological effects produced by this tachyonic era. We find that only a very small region of the parameter space (corresponding to slow-roll with tiny inflaton mass) allows for the tachyon to contribute some e-folds to inflation. In addition, non-adiabatic density perturbations are generated at the end of inflation. When the brane is moving relativistically this contribution can be of the same order as fluctuations produced 55 e-folds before the end of inflation. The additional contribution is very nearly scale-invariant and enhances the tensor/scalar ratio. Additional non-gaussianities will also be generated, sharpening current constraints on DBI-type models which already predict a significantly non-gaussian signal.

30 pages, 2 figures; v3, minor revision, JCAP version

References in corpus (71)

• Supergravity and a Confining Gauge Theory: Duality Cascades and $\chi$SB-Resolution of Naked Singularities
• Dielectric-Branes
• Towards Inflation in String Theory
• Rolling Tachyon
• 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
• Target Space Duality in String Theory
• A new approach to the evolution of cosmological perturbations on large scales
• Scalar Speed Limits and Cosmology: Acceleration from D-cceleration
• Nongaussian Isocurvature Perturbations from Inflation
• Cosmic String Production Towards the End of Brane Inflation
• The inflationary prediction for primordial non-gaussianity
• Cosmic F- and D-strings
• The Inflationary Brane-Antibrane Universe
• A new mechanism for generating density perturbations from inflation
• Tachyon Dynamics in Open String Theory
• Tachyon couplings on non-BPS D-branes and Dirac-Born-Infeld action
• Assisted inflation via tachyon condensation
• Boundary String Field Theory of the DDbar System
• On D3-brane Potentials in Compactifications with Fluxes and Wrapped D-branes
• TeV scale 5D $SU(3{)}_W$ unification and the fixed point anomaly cancellation with chiral split multiplets
• Dirac-Born-Infeld Action on the Tachyon Kink and Vortex
• Loop Corrections to Volume Moduli and Inflation in String Theory
• Running Non-Gaussianities in DBI Inflation
• Observational Constraints on Cosmic String Production During Brane Inflation
• A Microscopic Limit on Gravitational Waves from D-brane Inflation
• Generating the curvature perturbation at the end of inflation
• Inflation from Warped Space
• Multi-Throat Brane Inflation
• Assisted Tachyonic Inflation
• Brane-Antibrane Action from Boundary String Field Theory
• A Review on Tachyon Condensation in Open String Field Theories
• On the Moduli Space of the Cascading SU(M+p)xSU(p) Gauge Theory
• The Giant Inflaton
• Reheating the Universe after String Theory Inflation
• Modulated fluctuations from hybrid inflation
• Remarks on Tachyon Driven Cosmology
• Nongaussian and nonscale-invariant perturbations from tachyonic preheating in hybrid inflation
• Prospects of Inflation
• Holographic Cosmology 3.0
• Observing Brane Inflation
• Warped Reheating in Brane-Antibrane Inflation
• Tachyonic Inflation in the Braneworld Scenario
• On Noncommutative Open String Theories
• Brane Inflation and Cosmic String Tension in Superstring Theory
• Rolling the tachyon in super BSFT
• Einstein billiards and overextensions of finite-dimensional simple Lie algebras
• DBI Inflation in the Tip Region of a Warped Throat
• K3 x T^2/Z_2 orientifolds with fluxes, open string moduli and critical points
• Warped Reheating in Multi-Throat Brane Inflation
• Open Heterotic Strings
• Generating the Curvature Perturbation at the End of Inflation in String Theory
• Stability of D1-Strings Inside a D3-Brane
• Brane Inflation : String Theory viewed from the Cosmos
• The (p,q) String Tension in a Warped Deformed Conifold
• Inflationary Potential Reconstruction for a WMAP Running Power Spectrum
• Warped Tachyonic Inflation in Type IIB Flux Compactifications and the Open-String Completeness Conjecture
• Observing the Geometry of Warped Compactification via Cosmic Inflation
• Dark Matter And $B_s\to {\mu }^{+}{\mu }^{-}$ With Minimal $S{O}_{10}$ Soft SUSY Breaking II
• An Inflaton Mass Problem in String Inflation from Threshold Corrections to Volume Stabilization
• Generating the curvature perturbation with instant preheating
• Tachyonic Inflation in a Warped String Background
• An Improved Brane Anti-Brane Action from Boundary Superstring Field Theory and Multi-Vortex Solutions
• Slow Roll in Brane Inflation
• Brane inflation without slow-roll
• A New Approach to Axial Vector Model Calculations II
• Inter-Brane Potential and the Decay of a non-BPS-D-brane to Closed Strings
• On the Production of Open Strings from Brane Anti-Brane Annihilation

Cited by in corpus (22)

• String Cosmology: A Review
• p-adic Inflation
• f(R)-Brane
• Nongaussianity from Tachyonic Preheating in Hybrid Inflation
• Multifield DBI Inflation and Non-Gaussianities
• Large Nongaussianity from Nonlocal Inflation
• The hybrid inflation waterfall and the primordial curvature perturbation
• Combined local and equilateral non-Gaussianities from multifield DBI inflation
• Attractive Lagrangians for Noncanonical Inflation
• Scale Dependent Local Non-Gaussianity from Loops
• IR Inflation from Multiple Branes
• Systematics of multi-field effects at the end of warped brane inflation
• Tachyon Field in Intermediate Inflation on the Brane
• Tachyon Mediated Non-Gaussianity
• Curvatons in Warped Throats
• An Inflationary Scenario in Intersecting Brane Models
• Modulation of the waterfall by a gauge field
• Tachyon and Quintessence Brane-World Universe
• Dynamical System Analysis of Brane Induced Gravity with Tachyon Field
• Constant-roll Inflation in Brane Induced Gravity Cosmology
• Warm constant-roll inflation in brane-world cosmology
• Perturbations in some models of tachyonic inflation