Revisiting isocurvature bounds in models unifying the axion with the inflaton

Abstract

Axion scenarios in which the spontaneous breaking of the Peccei-Quinn symmetry takes place before or during inflation, and in which axion dark matter arises from the misalignment mechanism, can be constrained by Cosmic Microwave Background isocurvature bounds. Dark matter isocurvature is thought to be suppressed in models with axion-inflaton interactions, for which axion perturbations are assumed to freeze at horizon crossing during inflation. However, this assumption can be an oversimplification due to the interactions themselves. In particular, non-perturbative effects during reheating may lead to a dramatic growth of axion perturbations. We perform lattice calculations in two models in which the Peccei-Quinn field participates in inflation. We find that the growth of axion perturbations is such that the Peccei-Quinn symmetry is restored for an axion decay constant $f_A\lesssim 10^{16}$-$10^{17}$ GeV, leading to an over-abundance of dark matter, unless $f_A\lesssim 2\times 10^{11}$ GeV. For $f_A\gtrsim 10^{16}$-$10^{17}$ GeV we still find a large growth of axion perturbations at low momentum, such that a naive extrapolation to CMB scales suggests a violation of the isocurvature bounds.

30 pages, 22 figures

References in corpus (19)

• The Standard Model Higgs boson as the inflaton
• Power-counting and the Validity of the Classical Approximation During Inflation
• First results from a microwave cavity axion search at 24 micro-eV
• More Axions from Strings
• First Results from Axion Haloscope at CAPP around 10.7 $\mu$eV
• Unifying inflation with the axion, dark matter, baryogenesis and the seesaw mechanism
• Search for axion-like dark matter with ferromagnets
• Search for invisible axion dark matter of mass m${}_a=43\mu$eV with the QUAX--$a\gamma$ experiment
• Isocurvature bounds on axions revisited
• Enhanced Supernova Axion Emission and its Implications
• The Art of Lattice and Gravity Waves from Preheating
• Unification, Proton Decay and Topological Defects in non-SUSY GUTs with Thresholds
• Unifying inflation and dark matter with the Peccei-Quinn field: observable axions and observable tensors
• Quantum and Classical Behavior in Interacting Bosonic Systems
• Higgs inflation and suppression of axion isocurvature perturbation
• Primordial gravitational waves in a minimal model of particle physics and cosmology
• Axion Dark Matter, Proton Decay and Unification
• Accidental SO(10) axion from gauged flavour
• Axion Model with Intermediate Scale Fermionic Dark Matter

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• Searching for dilaton fields in the Ly$\alpha$ forest
• Higgs-dilaton model revisited: can dilaton act as QCD axion?
• Ultraviolet Sensitivity of Peccei-Quinn Inflation