Abstract
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.
| Original language | English |
|---|---|
| Journal | Journal of High Energy Physics |
| Volume | 2014 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2014 |
| Externally published | Yes |
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Keywords
- Cosmology of Theories beyond the SM
- Supergravity Models
ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
Multi-natural inflation in supergravity. / Czerny, Michael; Higaki, Tetsutaro; Takahashi, Fuminobu.
In: Journal of High Energy Physics, Vol. 2014, No. 5, 2014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Multi-natural inflation in supergravity
AU - Czerny, Michael
AU - Higaki, Tetsutaro
AU - Takahashi, Fuminobu
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - Cosmology of Theories beyond the SM
KW - Supergravity Models
UR - http://www.scopus.com/inward/record.url?scp=84924331574&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84924331574&partnerID=8YFLogxK
U2 - 10.1007/JHEP05(2014)144
DO - 10.1007/JHEP05(2014)144
M3 - Article
AN - SCOPUS:84924331574
VL - 2014
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 5
ER -