2019 Fiscal Year Annual Research Report
Comprehensive study of dark matter beyond WIMP paradigm
| Project/Area Number |
19J10946
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| Research Institution | Tohoku University |
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Principal Investigator |
Ho ShuーYu 東北大学, 理学研究科, 特別研究員(DC2)
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| Project Period (FY) |
2019-04-25 – 2021-03-31
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| Keywords | hidden monopole / axion portal coupling |
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| Outline of Annual Research Achievements |
In the first year of my research, I studied the hidden monopole dark matter (DM), which is an attractive DM model since the stability of the monopole DM is ensured by the topological nature and it can be produced naturally during the phase transition in the early universe.
In my study, I try to connect the hidden monopole DM to the visible sector by the axion portal coupling, and then it can be tested by the current and future direct search experiments such as COUPP and PICO. I also consider the constraints from the beam dump experiments because they can probe the axion-like particles. By comparing our results to these experiments, I found parameter regions where this model can be examined.
I published my result to JHEP and gave related presentations at many international conferences.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
I studied a dark matter model beyond the WIMP paradigm and submitted my result to the international journal, JHEP, and it had been accepted. To advertise my research work further, I attended many overseas conferences, domestic workshops, and group seminars, where I received a lot of questions and feedback improving my result.
Meanwhile, I am interested in the hidden sector since it may include the candidates for dark matter while resolve some cosmological or astrophysical problems. For instance, I am focusing on a hidden non-Abelian gauge theory with the complex scalars charged under hidden gauge symmetry. Interestingly, the hidden complex scalars can account for dark matter and the hidden gauge bosons in this model can relax the recent issue of the measurements of the Hubble parameter.
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| Strategy for Future Research Activity |
For my future research plan, I will continue my study on the dark matter models in the hidden sector. In particular, I am interested in the hidden photon dark matter, which can be produced by the quantum fluctuations during the inflationary epoch. The mass of the hidden photon dark matter is predicted to be larger than the micro electron volt due to the constraints from the CMB observations.
It is possible that the mass of the hidden photon dark matter in a wider range by alternative mechanisms. For example, it can be produced thermally during a phase transition in the early universe and contributes to the correct relic abundance. In this direction, I would like to construct a model including a hidden photon and to check the feasibility of this new mechanism under all of the constraints.
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