Axion Landscape Cosmology

Abstract

We study the cosmology of complex multi-axion theories. With O(100) fields and GUT scale energies these theories contain a vast number of vacua, inflationary trajectories and a natural dark matter candidate. We demonstrate that the vacua are stable on cosmological timescales. In a single theory, both large- and small-field inflation are possible and yield a broad range of cosmological observables, and vacuum decay can be followed by a relatively large number (> 60) of efolds of inflation. Light axions stabilized by gravitational instantons may constitute a natural dark matter candidate that does not spoil an axion solution to the strong CP problem.

arXiv comment46 pages, 7 figures

References in corpus (41)

• Axion Cosmology
• String Axiverse
• Cold and Fuzzy Dark Matter
• Ultralight scalars as cosmological dark matter
• Axions In String Theory
• The String Landscape, Black Holes and Gravity as the Weakest Force
• Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
• Flux Compactification
• The String Landscape and the Swampland
• Observational Consequences of a Landscape
• Scalar perturbations during multiple-field slow-roll inflation
• Distributions of nonsupersymmetric flux vacua
• Naturalness and the Weak Gravity Conjecture
• Evidence for a Lattice Weak Gravity Conjecture
• Transplanckian axions !?
• Euclidean Wormholes in String Theory
• Planckian Axions and the Weak Gravity Conjecture
• Weak Gravity Strongly Constrains Large-Field Axion Inflation
• On the Possibility of Large Axion Moduli Spaces
• A Toy Model for Open Inflation
• Constraints on Axion Inflation from the Weak Gravity Conjecture
• The Wasteland of Random Supergravities
• Relaxion Monodromy and the Weak Gravity Conjecture
• Efficient numerical solution to vacuum decay with many fields
• A Statistical Approach to Multifield Inflation: Many-field Perturbations Beyond Slow Roll
• On Algorithmic Universality in F-theory Compactifications
• Planckian Axions in String Theory
• An Ultralight Axion in Supersymmetry and Strings and Cosmology at Small Scales
• Transitions Between de Sitter Minima
• Approximating tunneling rates in multi-dimensional field spaces
• Heavy Tails in Calabi-Yau Moduli Spaces
• Trajectories with suppressed tensor-to-scalar ratio in Aligned Natural Inflation
• Systematics of Axion Inflation in Calabi-Yau Hypersurfaces
• Axions of Evil
• O($N$) Invariance of the Multi-Field Bounce
• The Thin-Wall Approximation in Vacuum Decay: a Lemma
• Systematics of Aligned Axions
• Open Hybrid Inflation
• Single-bubble Open Inflation: An Overview
• Action Principle for Isotropic General Relativity
• Vacuum Decay in General Relativity

Cited by in corpus (9)

• Wave Dark Matter
• Oscillations and Random Walk of the Soliton Core in a Fuzzy Dark Matter Halo
• Vortices and waves in light dark matter
• Construction of Wave Dark Matter Halos: Numerical Algorithm and Analytical Constraints
• Anthropic Bound on Dark Radiation and its Implications for Reheating
• Many-field Inflation: Universality or Prior Dependence?
• Interplay between Black Holes and Ultralight Dark Matter: Analytic Solutions
• Vortices and rotating solitons in ultralight dark matter
• 3D Vortices and rotating solitons in ultralight dark matter