Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP08(2016)044
Keywords
Beyond Standard Model; Cosmology of Theories beyond the SM
Categories
Funding
- MEXT KAKENHI [15H05889, 15K21733]
- JSPS KAKENHI [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
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2015R1D1A3A01019746]
- IBS [IBS-R018-D1]
- Korea Ministry of Education, Science and Technology, Gyeongsangbuk-Do
- Korea Ministry of Education, Science and Technology, Pohang City
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R018-D1-2016-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [15H05889, 26247042] Funding Source: KAKEN
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We study the formation and evolution of topological defects in an aligned axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized by a certain combination of the axions with decay constants much smaller than the conventional Peccei-Quinn breaking scale. When the underlying U(1) symmetries are spontaneously broken, the aligned structure in the axion field space exhibits itself as a complicated string-wall network in the real space. We find that the string-wall network likely survives until the QCD phase transition if the number of the Peccei-Quinn scalars is greater than two. The string-wall system collapses during the QCD phase transition, producing a significant amount of gravitational waves in the nano-Hz range at present. The typical decay constant is constrained to be below O(100) TeV by the pulsar timing observations, and the constraint will be improved by a factor of 2 in the future SKA observations.
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