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arXiv · 1404.4284

Axion Dark Matter with High-Scale Inflation

Eung Jin Chun
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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.

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Eung Jin Chun. 2014-04-16. Axion Dark Matter with High-Scale Inflation. https://doi.org/10.1016/j.physletb.2014.06.017

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