Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2019/05/028
Keywords
inflation; non-gaussianity; gravity
Funding
- ICTP Professor Visitor Program
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- CNPq (Brazil)
- Fapes (Brazil)
- CAPES (Brazil)
- Humboldt foundation (Germany)
Ask authors/readers for more resources
In this paper we establish formulae for the inflationary slow-roll parameters epsilon, eta and zeta as functions of the Ricci scalar R for f (R) theories of gravity. As examples, we present the analytic and numerical solutions of epsilon, eta and zeta as functions of the number of e-folds N in two important instances: for the Starobinsky model and for a f(R) reconstruction of the alpha-Attractors. The highlight of our proposal is to rewrite the slow-roll parameters in terms of f (R), which allows to find directly n(s), r, alpha(s) and f(NL)(equil) as functions of R itself. We obtain that both models indicate a small contribution to the non-Gaussianity parameters, which are in good agreement with current observational constraints.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available