Tensor modes on the string theory landscape

Abstract

We attempt an estimate for the distribution of the tensor mode fraction $r$ over the landscape of vacua in string theory. The dynamics of eternal inflation and quantum tunneling lead to a kind of democracy on the landscape, providing no bias towards large-field or small-field inflation regardless of the class of measure. The tensor mode fraction then follows the number frequency distributions of inflationary mechanisms of string theory over the landscape. We show that an estimate of the relative number frequencies for small-field vs large-field inflation, while unattainable on the whole landscape, may be within reach as a regional answer for warped Calabi-Yau flux compactifications of type IIB string theory.

LaTeX, 1+55 pages, 4 figures, v2: citations added, extended and more precise discussion of the vacuum count ratios in the 'landscape Drake equation' in section 4.4, 4.5 and in the conclusion 5

References in corpus (43)

• Monodromy in the CMB: Gravity Waves and String Inflation
• Flux Compactification
• The Anthropic Landscape of String Theory
• String Cosmology: A Review
• Large Nongaussianity in Axion Inflation
• High resolution CMB power spectrum from the complete ACBAR data set
• CMBPol Mission Concept Study: Probing Inflation with CMB Polarization
• A Microscopic Limit on Gravitational Waves from D-brane Inflation
• Sinks in the Landscape, Boltzmann Brains, and the Cosmological Constant Problem
• Holographic probabilities in eternal inflation
• Roulette Inflation with Kähler Moduli and their Axions
• Axion Inflation in Type II String Theory
• A Holographic Framework for Eternal Inflation
• New Sources of Gravitational Waves during Inflation
• Statistical analysis of the supersymmetry breaking scale
• The Wasteland of Random Supergravities
• Observable gravitational waves from inflation with small field excursions
• Cosmology From Random Multifield Potentials
• Towards a gauge invariant volume-weighted probability measure for eternal inflation
• Accidental Inflation in String Theory
• Eternal Symmetree
• Poly-instanton Inflation
• Holographic Multiverse
• Axion Inflation and Gravity Waves in String Theory
• Task Force on Cosmic Microwave Background Research
• A Global View on The Search for de-Sitter Vacua in (type IIA) String Theory
• Eternal Inflation, Bubble Collisions, and the Disintegration of the Persistence of Memory
• Stationary Measure in the Multiverse
• Exploring a string-like landscape
• Eternal inflation predicts that time will end
• The Search For Primordial Tensor Modes
• Universality of the Volume Bound in Slow-Roll Eternal Inflation
• Evidence for a bound on the lifetime of de Sitter space
• Brane-Antibrane Backreaction in Axion Monodromy Inflation
• A volume-weighted measure for eternal inflation
• Multi-field open inflation model and multi-field dynamics in tunneling
• Volume Weighted Measures of Eternal Inflation in the Bousso-Polchinski Landscape
• Axionic D3-D7 Inflation
• Future Foam
• Islands in the landscape
• A Stringy Mechanism for A Small Cosmological Constant
• Eternal Inflation, Global Time Cutoff Measures, and a Probability Paradox
• The Overshoot Problem in Inflation after Tunneling

Cited by in corpus (6)

• String Inflation After Planck 2013
• Tuning and Backreaction in F-term Axion Monodromy Inflation
• The Scale of Inflation in the Landscape
• Inflation with a graceful exit in a random landscape
• Local random potentials of high differentiability to model the Landscape
• A Local Wheeler-DeWitt Measure for the String Landscape