期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP05(2014)144
关键词
Cosmology of Theories beyond the SM; Supergravity Models
资金
- JSPS [24740135, 25800169]
- Inoue Foundation for Science
- World Premier International Center Initiative (WPI Program), MEXT, Japan
- [24111702]
- [21111006]
- [23104008]
- [22244030]
- [21244033]
- Grants-in-Aid for Scientific Research [25800169] Funding Source: KAKEN
We show that the recently proposed multi-natural inflation can be realized within the framework of 4D N = 1 supergravity. The inflaton potential mainly consists of two sinusoidal potentials that are comparable in size, but have different periodicity with a possible non-zero relative phase. For a sub-Planckian decay constant, the multi-natural inflation model is reduced to axion hilltop inflation. We show that, taking into account the effect of the relative phase, the spectral index can be increased to give a better fit to the Planck results, with respect to the hilltop quartic inflation. We also consider a possible UV completion based on a string-inspired model. Interestingly, the Hubble parameter during inflation is necessarily smaller than the gravitino mass, avoiding possible moduli destabilization. Reheating processes as well as non-thermal leptogenesis are also discussed.
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