Axion Dark Matter with High-Scale Inflation

Abstract

We show that supersymmetric axion models breaking the PQ symmetry by the interplay of non-renormalizable supersymmetric terms and soft supersymmetry breaking terms provide a natural framework not only for generating the axion scale from soft supersymmetry breaking scale $m_{3/2}$ but also for enhancing it during inflation by factor of order $\sqrt{H_I/m_{3/2}}$ where $H_I\simeq 10^{14}$ GeV according to the recent BICEP2 result. In this scheme, the PQ symmetry can stay broken throughout the whole history of the Universe if the reheat temperature is below $10^{10}$ GeV, or $m_{3/2}$ when the PQ fields couple strongly to thermal (Standard Model) particles. It is also shown that parametric resonance during preheating is not effective enough to induce non-thermal PQ symmetry restoration. As a consequence, axion models with the QCD anomaly $N_{DW}>1$ can be made free from the domain wall problem while the axion isocurvature perturbation is suppressed sufficiently for the axion scale during inflation larger than about $M_P (Ω_a h^2/0.12)^{1/2} ( F_a/10^{12} \mbox{GeV})^{0.6}$ GeV.

arXiv comment5 pages

References in corpus (9)

• Reheating after Inflation
• Universe Reheating after Inflation
• Supersymmetry Breaking in the Early Universe
• Axions : Theory and Cosmological Role
• Non-Thermal Phase Transitions after Inflation
• Cosmological Implications of Radiatively Generated Axion Scale
• Curvaton and QCD Axion in Supersymmetric Theories
• The abundance of relativistic axions in a flaton model of Peccei-Quinn symmetry
• Domain wall and isocurvature perturbation problems in axion models

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• Axion Models with High Scale Inflation
• High-Scale Axions without Isocurvature from Inflationary Dynamics
• Implications of an axino LSP for naturalness
• Diluting the inflationary axion fluctuation by a stronger QCD in the early Universe
• Elementary Theorems Regarding Blue Isocurvature Perturbations
• Cosmologically allowed regions for the axion decay constant $F_a$
• Cosmological Perturbations of Axion with a Dynamical Decay Constant
• Opening up a window on the postinflationary QCD axion
• Minimal solution to the axion isocurvature problem from a nonminimal coupling
• No Warm Inflation From a Vanilla Axion
• PQ-symmetry for a small Dirac neutrino mass, dark radiation and cosmic neutrinos