期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP01(2018)053
关键词
Cosmology of Theories beyond the SM; Beyond Standard Model; Solitons Monopoles and Instantons
资金
- MEXT KAKENHI [15H05889, JP15K21733]
- JSPS KAKENHI [17K05434, 17H01131, JP17H02875, JP17H02878, JP26247042, JP26287039]
- JSPS Research Fellowships
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Grants-in-Aid for Scientific Research [17H02875, 15H05889, 26247042, 16J02529] Funding Source: KAKEN
The string theory predicts many light fields called moduli and axions, which cause a cosmological problem due to the overproduction of their coherent oscillation after inflation. One of the prominent solutions is an adiabatic suppression mechanism, which, however, is non-trivial to achieve in the case of axions because it necessitates a large effective mass term which decreases as a function of time. The purpose of this paper is twofold. First, we provide an analytic method to calculate the cosmological abundance of coherent oscillation in a general situation under the adiabatic suppression mechanism. Secondly, we apply our method to some concrete examples, including the one where a string axion acquires a large effective mass due to the Witten effect in the presence of hidden monopoles.
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