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Title: Higgs inflation and teleparallel gravity
Authors: Raatikainen, Sami 
Räsänen, Syksy 
Keywords: Particles (Nuclear physics);Cosmic magnetic fields;Gauge fields (Physics);Black holes (Astronomy);Higgs bosons;Inflationary universe;Gravitation
Issue Date: 6-Dec-2019
Publisher: IOP Publishing
Journal: Journal of Cosmology and Astroparticle Physics 
Abstract: Teleparallel gravity is a formulation of general relativity that is physically equivalent to metric gravity if the gravitational action has the Einstein-Hilbert form and matter is minimally coupled. However, scalar fields generally couple directly to the connection, breaking the equivalence. In particular, this happens for the Standard Model Higgs. We show that a teleparallel theory with a non-minimally coupled scalar field has no linear scalar perturbations, and therefore cannot give successful inflation, unless the non-minimal coupling functions satisfy a particular relation. If the relation is satisfied, Higgs inflation can give an arbitrarily large tensor-to-scalar ratio r. Our results also apply to f(T) theories, as they are scalar-tensor theories written in different field coordinates. We discuss generalisation to more complicated actions.
Description: Article published in : Journal of Cosmology and Astroparticle Physics, 12 (2019)
DOI: 10.1088/1475-7516/2019/12/021
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