期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP06(2016)150
关键词
Beyond Standard Model; Cosmology of Theories beyond the SM
资金
- MEXT KAKENHI Grant [15H05889, 23104008]
- JSPS KAKENHI Grant [24740135, 26247042, 26287039]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- MEXT-Supported Program for the Strategic Research Foundation at Private Universities, Topological Science [S1511006]
- Max-Planck-Gesellschaft
- Korea Ministry of Education, Science and Technology
- Gyeongsangbuk-Do
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [NRF-2015R1D1A3A01019746]
- Grants-in-Aid for Scientific Research [26247042] Funding Source: KAKEN
We show that the required high quality of the Peccei-Quinn symmetry can be naturally explained in the aligned QCD axion models where the QCD axion arises from multiple axions with decay constants much smaller than the axion window, e.g., around the weak scale. Even in the presence of general Planck-suppressed Peccei-Quinn symmetry breaking operators, the effective strong CP phase remains sufficiently small in contrast to the standard axion models without the alignment. The QCD axion potential has small or large modulations due to the symmetry breaking operators, which can significantly affect the axion cosmology. When the axions are trapped in different minima, domain walls appear and their scaling behavior suppresses the axion isocurvature perturbations at super-horizon scales. Our scenario predicts many axions and saxions coupled to gluons, and they may be searched for at collider experiments. In particular, the recently found diphoton excess at 750GeV could be due to one of such (s) axions.
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