期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP05(2019)162
关键词
Cosmology of Theories beyond the SM; Confinement; Supersymmetric Gauge Theory; Supersymmetric Standard Model
资金
- DoE Early Career Grant [DE-SC0019225]
- DoE grant [DE-SC0009988]
- U.S. Department of Energy (DOE) [DE-SC0019225, DE-SC0009988] Funding Source: U.S. Department of Energy (DOE)
Several theoretical motivations point to ultralight QCD axions with large decay constants fa similar or equal to O(10(16)-10(17)) GeV, to which experimental proposals are dedicated. This regime is known to face the problem of overproduction of axion dark matter from the misalignment mechanism unless the misalignment angle (mis) is as small as O(10(-3)-10(-4)), which is generally considered a fine-tuning problem. We investigate a dynamical explanation for a small (mis). The axion mass arises from strong dynamics and may be sufficiently enhanced by early dynamics so as to overcome Hubble friction and drive the field value to the bottom of the potential long before the QCD phase transition. Together with an approximate CP symmetry in the theory, this minimum is very closely related to today's value and thus (mis) can automatically be well under unity. Owing to such efficient relaxation, the isocurvature perturbations are essentially damped. As an existence proof, using supersymmetric theories we illustrate that the Higgs coupling with the inflaton energy can successfully achieve this axion damping in a consistent inflationary cosmology.
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