Inflation on Moduli Space and Cosmic Perturbations

Abstract

We show that a moduli space of the form predicted by string theory, lifted by supersymmetry breaking, gives rise to successful inflation for large regions of parameter space without any modification or fine tuning. This natural realization of inflation relies crucially on the complex nature of the moduli fields and the multiple points of enhanced symmetry, which are generic features of moduli space but not usually considered in inflationary model building. Our scenario predicts cosmic perturbations with an almost exactly flat spectrum for a wide range of scales with running on smaller, possibly observable, scales. The running takes the form of either an increasingly steep drop off of the spectrum, or a rise to a bump in the spectrum before an increasingly steep drop off.

23 pages, 4 figures; Added Fig. 1 and re-emphasis on dynamical selection of desirable initial angles for inflaton modulus. To be published in JHEP

References in corpus (21)

• String Theory Dynamics In Various Dimensions
• Unity of Superstring Dualities
• Towards Inflation in String Theory
• False Vacuum Inflation with Einstein Gravity
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• A more accurate analytic calculation of the spectrum of cosmological perturbations produced during inflation
• Natural Inflation: Particle Physics Models, Power Law Spectra for Large Scale Structure, and Constraints from COBE
• Supersymmetry Breaking in the Early Universe
• Thermal Inflation and the Moduli Problem
• Inflation and Eternal Inflation
• Inflation, Supergravity and Superstrings
• Challenges for Superstring Cosmology
• Enhancement of superhorizon scale inflationary curvature perturbations
• Solving the Cosmological Moduli Problem with Weak Scale Inflation
• Modular Cosmology
• Flattening the Inflaton's Potential with Quantum Corrections
• The Spectrum of Density Perturbations produced during Inflation to Leading Order in a General Slow-Roll Approximation
• Enhanced Gauge Symmetries in Superstring Theories
• Scale Dependent Spectral Index in Slow Roll Inflation
• Successful Modular Cosmology
• Enhanced Symmetries and the Ground State of String Theory

Cited by in corpus (18)

• Encyclopaedia Inflationaris
• Inflation Dynamics and Reheating
• The inflationary prediction for primordial non-gaussianity
• Hilltop Inflation
• Inflation models after WMAP year three
• Particle physics models of inflation
• Thermal Inflation and the Gravitational Wave Background
• Trapped Quintessential Inflation in the context of Flux Compactifications
• From the Spectrum to Inflation : An Inverse Formula for the General Slow-Roll Spectrum
• Parameterizing the Power Spectrum: Beyond the Truncated Taylor Expansion
• The inflationary origin of the Cold Spot anomaly
• On the fate of coupled flat directions during inflation
• The Origin of the Large-Scale Structure in the Universe: Theoretical and Statistical Aspects
• Testing Two-Field Inflation
• Clarifying Inflation Models: the Precise Inflationary Potential from Effective Field Theory and the WMAP data
• Hidden in the background: a local approach to CMB anomalies
• Wronskian Formulation of the Spectrum of Curvature Perturbations
• Couplings and spectra in modular inflation