Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 78, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-018-6246-6
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Funding
- JSPS KAKENHI Grant [17H02894, 17K18778, 16K17689]
- MEXT KAKENHI Grant [15H05895, 17H06359, 16H01095]
- Daiko foundation
- Grants-in-Aid for Scientific Research [16K17689, 17H02894, 16H01095, 17K18778] Funding Source: KAKEN
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We initiate a study on various cosmological imprints of string axions whose scalar potentials have plateau regions. In such cases, we show that a delayed onset of oscillation rather generically leads to a parametric resonance instability. In particular, for ultralight axions, the parametric resonance can enhance the power spectrum slightly below the Jeans scale, alleviating the tension with the Lyman alpha forest observations. We also argue that a sustainable resonance can lead to an emission of gravitational waves at the frequency bands which are detectable by gravitational wave interferometers and pulsar timing arrays and also to a succeeding oscillon formation.
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