Year: 2014
Type: article
Abstract: We show that the recently proposed multi-natural inflation can be realized within the framework of 4D $ \mathcal{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.
Source: Journal of High Energy Physics
Authors: Michael Czerny, Tetsutaro Higaki, Fuminobu Takahashi
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: research on cosmological nonlinear and non-perturbative gravitational phenomena, G1701892308, Research on phenomenological/cosmological aspects of moduli field in the string theory, The exploration of extradimensions in terms of a variety of cosmophysical phenomena caused by axionic moduli, G3439538557, G3988090857, G4474452502, Evolution of the early Universe based on the results of Planck and LHC, G5473262123, G6113636417, G6126871162, G7874054138
OpenAlex ID: W2094781528