Inflation with R-2 term in the Palatini formulation

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http://hdl.handle.net/10138/311471

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Enckell , V-M , Enqvist , K , Räsänen , S & Wahlman , L-P 2019 , ' Inflation with R-2 term in the Palatini formulation ' , Journal of Cosmology and Astroparticle Physics , vol. 2019 , no. 2 , 022 . https://doi.org/10.1088/1475-7516/2019/02/022

Title: Inflation with R-2 term in the Palatini formulation
Author: Enckell, Vera-Maria; Enqvist, Kari; Räsänen, Syksy; Wahlman, Lumi-Pyry
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2019-02
Language: eng
Number of pages: 9
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/311471
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 + alpha R-2, we find that the R-2 term decreases the height of the effective inflaton potential. By adjusting the value of a, 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.
Subject: inflation
gravity
VARIATIONAL PRINCIPLE
INITIAL CONDITIONS
HIGGS
LAGRANGIANS
SCALARON
GRAVITY
115 Astronomy, Space science
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