Higgs-R^2 inflation - full slow-roll study at tree level

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Enckell , V-M , Enqvist , K , Räsänen , S & Wahlman , L-P 2020 , ' Higgs-R^2 inflation - full slow-roll study at tree level ' , Journal of Cosmology and Astroparticle Physics , no. 1 , 041 . https://doi.org/10.1088/1475-7516/2020/01/041

Title: Higgs-R^2 inflation - full slow-roll study at tree level
Author: Enckell, Vera-Maria; Enqvist, Kari; Räsänen, Syksy; Wahlman, Lumi-Pyry
Contributor organization: Helsinki Institute of Physics
Department of Physics
Date: 2020-01-20
Language: eng
Number of pages: 18
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
DOI: https://doi.org/10.1088/1475-7516/2020/01/041
URI: http://hdl.handle.net/10138/324902
Abstract: We consider Higgs inflation with an α R2 term. It adds a new scalar degree of freedom, which leads to a two-field model of inflation. We do a complete slow-roll analysis of the three-dimensional parameter space of the R2 coefficient α, the non-minimal coupling ξ and the Higgs self-coupling λ. We find three classes of inflationary solutions, but only pure R2 and attractor solutions fit observations. We find that pure Higgs inflation is impossible when the R2 term is present regardless of how small α is. However, we can have Higgs-like inflation, where the amplitude of the perturbations does not depend on α and the predictions as a function of e-folds are the same as in Higgs inflation, although the inflationary trajectory is curved in field space. The spectral index is 0.939 < nR < 0.967, and constraining it to the observed range, the tensor-to-scalar ratio varies from 3.8×10−3 to the maximum allowed by observations, 0.079. Observational constraints on isocurvature perturbations contribute to these limits, whereas non-Gaussianity is automatically in the range allowed by observations.
Subject: ENERGY
cosmology connection
modified gravity
particle physics
114 Physical sciences
Peer reviewed: Yes
Rights: other
Usage restriction: openAccess
Self-archived version: acceptedVersion

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