期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2018/10/008
关键词
axions; gravitational waves / theory; physics of the early universe
资金
- JSPS KAKENHI [JP17H02894, JP17K18778, JP15H05895, JP17H06359]
- JSPS Bilateral Joint Research Projects (JSPS-NRF collaboration) String Axion Cosmology
- JSPS [26887018, 16H01095, 18H04349, 16K17689]
- Building of Consortia for the Development of Human Resources in Science and Technology
- Daiko Foundation
- Grants-in-Aid for Scientific Research [16H01095, 26887018, 16K17689, 18H04349] Funding Source: KAKEN
Axions predicted in string theory may have a scalar potential which has a much shallower potential region than the conventional cosine potential. We first show that axions which were located at such shallow potential regions generically undergo prominent resonance instabilities: the well-known narrow resonance and/or the flapping resonance, which has not been well investigated. We also study non-linear dynamics of axions caused by these resonance instabilities based on lattice simulation. We find that string axions in various mass ranges generate gravitational waves (GWs) with peaks at various frequencies determined by the mass scales, dubbed the GW forest. This may allow us to explore string axiverse through future multi-frequency GW observations. We also investigate GWs produced by the axion which accounts for present dark matter component.
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