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Fast-Rolling Relaxion

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arxiv 1904.02545 v2 pith:EBASINNR submitted 2019-04-04 hep-ph

classification hep-ph
keywords fieldmechanismsrelaxionfast-rollinghiggsinflationmodelstop
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We discuss new mechanisms to stop the relaxion field during inflation. They can be realized in a generic model, including the original model but in a quite different parameter region. We consider a fast-rolling relaxion field, which can go over the bumps created by QCD-like dynamics. Then, in one of the mechanisms, we stop it with a parametric resonance of the Higgs field. The mechanisms are free from a super-Planckian field excursion or a gigantic number of e-folds of inflation. The relaxion has a mass around the weak scale and mixes with the Higgs boson, which enhances the testability of our mechanisms.

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Cited by 1 Pith paper

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  1. Vacuum Metastability from Axion-Higgs Criticality

    hep-ph 2024-12 conditional novelty 6.0 of 10

    An ALP-Higgs coupling can lower the vacuum instability scale to near the weak scale, predicting an axion-like particle between 1 MeV and 20 GeV that future experiments can fully probe.

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