Work

Kähler moduli double inflation

Year: 2011

Type: article

Abstract: We show that double inflation is naturally realized in Kähler moduli inflation, which is caused by moduli associated with string compactification. We find that there is a small coupling between the two inflatons which leads to amplification of perturbations through parametric resonance in the intermediate stage of double inflation. This results in the appearance of a peak in the power spectrum of the primordial curvature perturbation. We numerically calculate the power spectrum and show that the power spectrum can have a peak on observationally interesing scales. We also compute the TT-spectrum of CMB based on the power spectrum with a peak and see that it better fits WMAP 7-years data.

Source: Journal of Cosmology and Astroparticle Physics

DOI: 10.1088/1475-7516/2011/02/004

Authors: Masahiro Kawasaki, Koichi Miyamoto

Institutions: Kavli Institute for the Physics and Mathematics of the Universe, Institute for Cosmic Ray Research, The University of Tokyo

Language: German

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funder: Ministry of Education, Culture, Sports, Science and Technology

Awards: G7101995382, G7874054138