Elliptic Inflation: Generating the curvature perturbation without slow-roll

Abstract

There are many inflationary models in which inflaton field does not satisfy the slow-roll condition. However, in such models, it is always difficult to generate the curvature perturbation during inflation. Thus, to generate the curvature perturbation, one must introduce another component to the theory. To cite a case, curvatons may generate dominant part of the curvature perturbation after inflation. However, we have a question whether it is unrealistic to consider the generation of the curvature perturbation during inflation without slow-roll. Assuming multi-field inflation, we encounter the generation of the curvature perturbation during inflation without slow-roll. The potential along equipotential surface is flat by definition and thus we do not have to worry about symmetry. We also discuss about KKLT models, in which corrections lifting the inflationary direction may not become a serious problem if there is a symmetry enhancement at the tip (not at the moving brane) of the inflationary throat.

27pages, 8figures, to appear in JCAP

Cited by in corpus (9)

• Modulated Inflation
• Hilltop Curvatons
• Cosmological perturbations from an inhomogeneous phase transition
• Spotted Inflation
• Remote Inflation: Hybrid-like inflation without hybrid-type potential
• Ambiguity in running spectral index with an extra light field during inflation
• Modulated inflation from kinetic term
• Evolution of curvature perturbation in generalized gravity theories
• Remote Inflation as hybrid-like sneutrino/MSSM inflation