Inflation and pseudo-Goldstone Higgs

Preprint number: CP3-Origins-2016-49 DNRF90
Authors: Tommi Alanne (CP3-Origins), Francesco Sannino (CP3-Origins & DIAS), Tommi Tenkanen (University of Helsinki & Helsinki Institute of Physics & Queen Mary University of London), and Kimmo Tuominen (University of Helsinki & Helsinki Institute of Physics)
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We consider inflation within a model framework where the Higgs boson arises as a pseudo-Goldstone boson associated with the breaking of a global symmetry at a scale significantly larger than the electroweak one. We show that in such a model the scalar self-couplings can be parametrically suppressed and, consequently, the non-minimal couplings to gravity can be of order one or less, while the inflationary predictions of the model remain compatible with the precision cosmological observations. Furthermore, in the model we study, the existence of the electroweak scale is entirely due to the inflaton field. Our model therefore suggests that inflation and low energy particle phenomenology may be more entwined than assumed so far.