Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations

Abstract

We compare the Infrared Dirac-Born-Infeld (IR DBI) brane inflation model to observations using a Bayesian analysis. The current data cannot distinguish it from the \LambdaCDM model, but is able to give interesting constraints on various microscopic parameters including the mass of the brane moduli potential, the fundamental string scale, the charge or warp factor of throats, and the number of the mobile branes. We quantify some distinctive testable predictions with stringy signatures, such as the large non-Gaussianity, and the large, but regional, running of the spectral index. These results illustrate how we may be able to probe aspects of string theory using cosmological observations.

54 pages, 13 figures. v2: non-Gaussianity constraint has been applied to the model; parameter constraints have tightened significantly, conclusions unchanged. References added; v3, minor revision, PRD version

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Cited by in corpus (24)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Monodromy in the CMB: Gravity Waves and String Inflation
• Holographic Systematics of D-brane Inflation
• Chasing Brane Inflation in String-Theory
• On the full quantum trispectrum in multi-field DBI inflation
• Quantum modes in DBI inflation: exact solutions and constraints from vacuum selection
• Reconstructing a general inflationary action
• K-inflationary Power Spectra in the Uniform Approximation
• Lorentz boost and non-Gaussianity in multi-field DBI-inflation
• Constraints on Kinetically Modified Inflation from WMAP5
• Constraints on Brane Inflation and Cosmic Strings
• Cosmological constraints on general, single field inflation
• On the degeneracy between primordial tensor modes and cosmic strings in future CMB data from Planck
• Brane Inflation is Attractive
• Inflationary potentials in DBI models
• Fine-Tuning in DBI Inflationary Mechanism
• Gravitational Wave Constraints on Multi-Brane Inflation
• Inflation in DBI models with constant gamma
• Dynamics of D3-D7 Brane Inflation in Throats
• Brane Inflation and the Overshoot Problem
• Reconstructing Single Field Inflationary Actions From CMBR Data
• Different approaches to the second order Klein-Gordon equation
• On the four-dimensional effective theories in brane-worlds
• Modification from Noncommutative Inflation