Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.11889/6097
Title: Inflation with R2 term in the Palatini formulation
Authors: Enckell, Vera-Maria 
Enqvist, Kari 
Rasanen, Syksy 
Wahlman, Lumi-Pyry 
Keywords: Gravitation;Inflationary universe;Scalar field theory;Astrodynamics;Astronomical spectroscopy;Cosmological constants
Issue Date: Feb-2019
Publisher: IOP Publishing
Journal: Journal of Cosmology and Astroparticle Physics 
Abstract: We study scalar field inflation in F(R) gravity in the Palatini formulation of general relativity. Unlike in the metric formulation, in the Palatini formulation F(R) gravity does not introduce new degrees of freedom. However, it changes the relations between existing degrees of freedom, including the inflaton and spacetime curvature. Considering the case F(R)=R+α R2, we find that the R2 term decreases the height of the effective inflaton potential. By adjusting the value of α, this mechanism can be used to suppress the tensor-to-scalar ratio r without limit in any scalar field model of inflation without affecting the spectrum of scalar perturbations.
Description: Article published in : Journal of Cosmology and Astroparticle Physics, 02 (2019)
URI: http://hdl.handle.net/20.500.11889/6097
DOI: https://doi.org/10.1088%2F1475-7516%2F2019%2F02%2F022
10.1088/1475-7516/2019/02/022
https://doi.org/10.1088%2F1475-7516%2F2019%2F02%2F022
https://doi.org/10.1088%2F1475-7516%2F2019%2F02%2F022
https://doi.org/10.1088%2F1475-7516%2F2019%2F02%2F022
https://doi.org/10.1088%2F1475-7516%2F2019%2F02%2F022
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