Unified origin of axion and monopole dark matter, and solution to the domain-wall problem
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PhysRevD.98.043535.pdf
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190.59 KB
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Author(s)
Sato, Ryosuke
Takahashi, Fuminobu
Yamada, Masaki
Date Issued
August 2018
Journal
Physical Review D
Publisher
American Physical Society
Citation
Sato, Ryosuke et al. "Unified origin of axion and monopole dark matter, and solution to the domain-wall problem." Physical Review D 98, 4 (August 2018): 043535
Version
Final published version
Abstract
We propose a scenario in which the spontaneous breakdown of the Peccei-Quinn symmetry leads to monopole production. Both the axion and the monopole contribute to dark matter, and the Witten effect on the axion mass is a built-in feature. In the Kim-Shifman-Vainshtein-Zakharov-type axion model, seemingly different vacua are actually connected by the hidden gauge symmetry, which makes the axionic string unstable and separate into two Alice strings. The Alice string is attached to a single domain wall due to the QCD instanton effect, solving the domain-wall problem. This is in the same spirit of the Lazarides-Shafi mechanism, although the discrete Peccei-Quinn symmetry is not embedded into the center of the original gauge symmetry. In the Dine-Fischler-Srednicki-Zhitnitsky-type axion model, the domain-wall problem is avoided by the Witten effect. If the Peccei-Quinn symmetry is explicitly broken by a small amount, monopoles acquire a tiny electric charge and become minicharged dark matter. Interestingly, the quality of the Peccei-Quinn symmetry is closely tied to darkness of dark matter.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.98.043535
