Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP01(2020)185
Keywords
Phenomenological Models
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Funding
- JSPS KAKENHI [JP15H05889, JP15K21733, JP17H02875, JP17H02878, 19J10946]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Grants-in-Aid for Scientific Research [19J10946] Funding Source: KAKEN
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Hidden monopole is a plausible dark matter candidate due to its stability, but its direct experimental search is extremely difficult due to feeble interactions with the standard model particles in the minimal form. Then, we introduce an axion, a, connecting the hidden monopole and the standard model particles and examine the current limits and future prospects of direct dark matter searches and beam-dump experiments. We find two parameter regions around m(a) = O(10) MeV, f(a) = O(10(5)) GeV and m(a) = O(100) MeV, f(a) = O(10(4)) GeV where monopole dark matter and the axion are respectively within the reach of the future experiments such as PICO-500 and SHiP. We also note that the hidden photons mainly produced by the axion decay contribute to dark radiation with increment N-eff similar or equal to 0.6 which can relax the H-0 tension.
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