期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP04(2019)149
关键词
Cosmology of Theories beyond the SM; Beyond Standard Model; Compactification and String Models; Supersymmetric Standard Model
资金
- Tohoku University
- JSPS KAKENHI [JP15H05889, JP15K21733, JP17H02875, JP17H02878]
- NRF Strategic Research Program [NRF-2017R1E1A1A01072736]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
We show that the cosmological abundance of string axions is much smaller than naive estimates if the Hubble scale of inflation, H-inf , is sufficiently low (but can still be much higher than the axion masses) and if the inflation lasts sufficiently long. The reason is that the initial misalignment angles of the string axions follow the Bunch-Davies distribution peaked at the potential minima. As a result, the cosmological moduli problem induced by the string axions can be significantly relaxed by low-scale inflation, and astrophysical and cosmological bounds are satisfied over a wide range of the mass without any fine-tuning of the initial misalignment angles. Specifically, the axion with its decay constant f(phi) = 10(16) GeV satisfies the bounds over 10(-18) eV less than or similar to m(phi) less than or similar to 10 TeV for H-inf less than or similar to 10 keV-10(6) GeV. We also discuss cases with multiple axions and the QCD axion.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据