A dynamical weak scale from inflation

You, Tevong

doi:10.1088/1475-7516/2017/09/019

Cited by 20 publications

(26 citation statements)

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“…An improvement comes from trapping using particle production [5,6]. The relaxion's shift symmetry permits an anomalous coupling to gauge bosons and a derivative coupling to fermions,…”

mentioning

confidence: 99%

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Leptogenesis in cosmological relaxation with particle production

Son

You

2019

Phys. Rev. D

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Cosmological relaxation of the electroweak scale is improved by using particle production to trap the relaxion. We combine leptogenesis with such a relaxion model that has no extremely small parameters or large e-foldings. Scanning happens after inflation-now allowed to be at a high scale-over a sub-Planckian relaxion field range for a cutoff scale of new physics up to O(100) TeV. Particle production by the relaxion also reheats the universe and generates the baryonic matterantimatter asymmetry. We propose a realisation in which out-of-equilibrium leptons, produced by the relaxion, scatter with the thermal bath through interactions that violate CP and lepton number via higher-dimensional operators. Such a minimal effective field theory setup, with no new physics below the cutoff, naturally decouples new physics while linking leptogenesis to relaxion particle production; the baryon asymmetry of the universe can thus be intrinsically tied to a weak scale hierarchy.

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“…An improvement comes from trapping using particle production [5,6]. The relaxion's shift symmetry permits an anomalous coupling to gauge bosons and a derivative coupling to fermions,…”

mentioning

confidence: 99%

“…In a minimal setup which is our baseline assumption, such a fermion coupling can arise at low energies through renormalization, involving the coupling to the gauge boson f V , despite its absence at high energies. The exponential production of gauge bosons is an efficient source of friction [5][6][7][8][9][10][11]. In the models of Refs.…”

mentioning

confidence: 99%

Leptogenesis in cosmological relaxation with particle production

Son

You

2019

Phys. Rev. D

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“…Before closing this subsection, let us comment on the relation between the relaxion potential discussed above and the that given in subsection IX B. For that purpose, we define 23 The mass scales f k do not need to be an exact geometric series. The upper bound on a comes from the requirement that Eq.…”

Section: Clockwork With Progressively Increasing Vevsmentioning

confidence: 99%

Fast-rolling relaxion

Ibe

Shoji

Suzuki

2019

J. High Energ. Phys.

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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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“…However, the idea of the axion coupling only to weak gauge bosons but not to photons might be lost at higher-order corrections where dissipation to photons could stop the axion from approaching the small EW scale. See [22,23] for alternative realizations of the relaxion with particle production.…”

Section: Introductionmentioning

confidence: 99%

Paper-boat relaxion

Wang

2019

Phys. Rev. D

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A new relaxion mechanism is proposed where a small electroweak scale is preferably selected earlier than the larger one due to a potential instability, which is different from previously proposed stopping mechanisms by either Hubble friction from an increasing periodic barrier or thermal friction from gauge boson production. The sub-Planckian field excursion of an axion can be achieved without violating the bound on the e-folding number from a quantum gravity perspective; and our relaxion can be identified as a QCD axion, preserving the Peccei-Quinn solution to the strong CP problem as well as making up all the cold dark matter in our current Universe.

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A dynamical weak scale from inflation

Cited by 20 publications

References 50 publications

Leptogenesis in cosmological relaxation with particle production

Leptogenesis in cosmological relaxation with particle production

Fast-rolling relaxion

Paper-boat relaxion

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