A warped relaxion

Fonseca, Nayara; Harling, Benedict von; Lima, Leonardo de; Machado, Camila S.

doi:10.1007/jhep07(2018)033

Cited by 13 publications

(13 citation statements)

References 83 publications

(114 reference statements)

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“…Instead, one predicts at least one very light and very weakly interacting particle. This very change of paradigm has therefore far-reaching implications for strategies to search for new physics linked to the understanding of the weak scale and has consequently triggered a large literature: On general model building concerns [2][3][4][5][6][7][8], on attempts to do this without inflation [9,10], on issues related to inflation [11][12][13][14][15][16] and reheating [17], on UV completions involving supersymmetry [15,18,19], composite Higgs [20][21][22], two-Higgs-doublet models [23], a mirror copy of the Standard Model [24], a Nelson-Barr model [25], clockwork axions [26][27][28], warped extra dimensions [29] or other constructions with multiple axions [30], on phenomenological aspects and experimental signatures [31][32][33][34], and on alternative implementations of the mechanism that do not require any barriers [35,36].…”

Section: Contentsmentioning

confidence: 99%

“…The slope of the potential along which the axion-like field is rolling and its coupling to the Higgs field are generated due to a small effective breaking of a shift symmetry. This can be reconciled with the pseudo-Nambu-Goldstone (PNGB) boson nature of the relaxion if the slope arises from a second oscillatory potential with a period much larger than f in the so-called clockwork axion framework [26][27][28], in N -site constructions [30] or in warped extradimensional ones [29]. 1 If the relaxion is the QCD axion (GKR1), the Peccei-Quinn solution to the strong CP problem can be preserved only if new dynamics is introduced at the end 1 A completely different approach for a UV completion was discussed in string compactifications.…”

Section: Contentsmentioning

confidence: 99%

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Higgs relaxation after inflation

Fonseca

Morgante

Servant

2018

J. High Energ. Phys.

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We show that the mechanism of cosmological relaxation of the electroweak scale can take place independently of the inflation mechanism, thus relieving burdens from the original relaxion proposal. What eventually stops the (fast-rolling) relaxion field during its cosmological evolution is the production of particles whose mass is controlled by the Higgs vacuum expectation value. We first show that Higgs particle production does not work for that purpose as the Higgs field does not track the minimum of its potential in the regime where Higgs particles get efficiently produced through their coupling to the relaxion. We then focus on gauge boson production. We provide a detailed analysis of the scanning and stopping mechanism and determine the parameter space for which the relaxion mechanism can take place after inflation, while being compatible with cosmological constraints, such as the relaxion dark matter overabundance and Big Bang Nucleosynthesis. We find that the cutoff scale can be as high as two hundreds of TeV. In this approach, the relaxion sector is responsible for reheating the visible sector. The stopping barriers of the periodic potential are large and Higgs-independent, facilitating model-building. The allowed relaxion mass ranges from 200 MeV up to the weak scale. In this scenario, the relaxion field excursion is subplanckian, and is thus many orders of magnitude smaller than in the original relaxion proposal.

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Section: Contentsmentioning

confidence: 99%

Section: Contentsmentioning

confidence: 99%

Higgs relaxation after inflation

Fonseca

Morgante

Servant

2018

J. High Energ. Phys.

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“…M , to generate a single field potential with two cosines with hierarchically different decay constants, as required in relaxion models [6]. Such a construction was explored in [75].…”

Section: Super-planckian Decay Constants From Cfts/throatsmentioning

confidence: 99%

Super-Planckian axions from near-conformality

et al. 2019

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We present a novel framework for obtaining large hierarchies in axion decay constants as well as trans-Planckian field excursions, with no need for tuning or a large number of fields. We consider a model with two or more conformal field theories with a common cutoff, which are linked by a gauged diagonal symmetry. This construction is dual to the geometry of a warped space with two or more throats glued at a common brane. Besides allowing for calculability, the dual picture makes it possible to interpret the hierarchy of decay constants entirely in terms of the geometry. Our setup can be applied to any framework which requires large field excursions or multiple hierarchies of decay constants, such as natural inflation or ultralight axions.

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“…Next, we see the analytic structure of ∆(ν) ≡ det Ξ. As can be seen from Ξ, ∆(ν) has simple poles 19 at…”

Section: (A2)mentioning

confidence: 95%

“…(A17) 19 For a special case, A ∈ Z, two simple poles merges into a pole of order 2. The following discussion is also applicable to such a case.…”

Section: (A2)mentioning

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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A warped relaxion

Cited by 13 publications

References 83 publications

Higgs relaxation after inflation

Higgs relaxation after inflation

Super-Planckian axions from near-conformality

Fast-rolling relaxion

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