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- Title
A smooth constant-roll to a slow-roll modular inflation transition.
- Authors
Oikonomou, V. K.
- Abstract
In this work, we investigate how a smooth transition from a constant-roll to a slow-roll inflationary era may be realized in the context of a canonical scalar field theory. We study in some detail the dynamical evolution of the cosmological system, and we investigate whether a stable attractor exists, both numerically and analytically. We also investigate the slow-roll era and as we demonstrate, the partially compatibility of the resulting scalar theory may be achieved with the potential of the latter belonging to a class of modular inflationary potentials. The novel features of the constant-roll to slow-roll transition which we achieved are firstly that it is not compelling for the slow-roll era to last for -60 -foldings, but it may last for a smaller number of -foldings, since some -foldings may occur during the constant-roll era. Secondly, when the slow-roll era occurs after the constant-roll era, the graceful exit from inflation may occur, a feature absent in the constant-roll scenario, due to the stability properties of the final attractor in the constant-roll case.
- Subjects
INFLATIONARY universe; COSMOLOGICAL principle; ATTRACTORS (Mathematics); MATHEMATICAL models of inflation; DYNAMICAL systems
- Publication
International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology, 2018, Vol 27, Issue 2, p-1
- ISSN
0218-2718
- Publication type
Article
- DOI
10.1142/S0218271818500098