Axion protection from flavor

Cheung, Clifford

doi:10.1007/jhep06(2010)074

Cited by 21 publications

(17 citation statements)

References 50 publications

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“…In particular, all contributions to the axion potential from other PQ breaking sources must be at least ten orders of magnitude suppressed compared to that from QCD instantons. Phenomenological approaches in field theory trying to realize such a PQ symmetry have been pursued [15][16][17]; see [18] for a recent approach. However, since global symmetries are believed to be always broken by quantum gravitational effects, it is worthwhile exploring axions in string theory and under what circumstances they could solve the strong-CP problem.…”

Section: Jhep11(2010)105mentioning

confidence: 99%

An M theory solution to the strong CP-problem, and constraints on the axiverse

Acharya

Bobkov

Kumar

2010

J. High Energ. Phys.

191

167

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Abstract:We give an explicit realization of the "String Axiverse" discussed in Arvanitaki et. al [1] by extending our previous results on moduli stabilization in M theory to include axions. We extend the analysis of [1] to allow for high scale inflation that leads to a moduli dominated pre-BBN Universe. We demonstrate that an axion which solves the strong-CP problem naturally arises and that both the axion decay constants and GUT scale can consistently be around 2 × 10 16 GeV with a much smaller fine tuning than is usually expected. Constraints on the Axiverse from cosmological observations, namely isocurvature perturbations and tensor modes are described. Extending work of Fox et. al [2], we note that the observation of tensor modes at Planck will falsify the Axiverse completely. Finally we note that Axiverse models whose lightest axion has mass of order 10 −15 eV and with decay constants of order 5 × 10 14 GeV require no (anthropic) fine-tuning, though standard unification at 10 16 GeV is difficult to accommodate.

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Section: Jhep11(2010)105mentioning

confidence: 99%

An M theory solution to the strong CP-problem, and constraints on the axiverse

Acharya

Bobkov

Kumar

2010

J. High Energ. Phys.

191

167

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“…Although here we have some more freedom in choosing the values of the charges X e , in order to enforce the breaking U (1) 4 It is easy to verify that the bilinear terms alone yield the same two possibilities listed in Eq. (27). Let us then consider quadrilinear couplings.…”

Section: Dfsz-type Of Axion Modelsmentioning

confidence: 99%

Window for preferred axion models

2017

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Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review D 96, 075003 c 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We discuss phenomenological criteria for defining "axion windows," namely regions in the parameter space of the axion-photon coupling where realistic models live. Currently, the boundaries of this region depend on somewhat arbitrary criteria, and it would be highly desirable to specify them in terms of precise phenomenological requirements. We first focus on hadronic axion models within post-inflationary scenarios, in which the initial abundance of the new vectorlike quarks Q is thermal. We classify their representations R Q by requiring that (i) the Q are sufficiently short lived to avoid issues with long-lived strongly interacting relics, (ii) the theory remains weakly coupled up to the Planck scale. The more general case of multiple R Q is also studied, and the absolute upper and lower bounds on the axion-photon coupling as a function of the axion mass is identified. Pre-inflationary scenarios in which the axion decay constant remains bounded as f a ≤ 5 × 10 11 GeV allow for axion-photon couplings only about 20% larger. Realistic Dine-Fischler-Srednicki-Zhitnitsky type of axion models also remain encompassed within the hadronic axion window. Some mechanisms that can allow to enhance the axion-photon coupling to values sizeably above the preferred window are discussed.

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“…Anomalies in the discrete symmetries used to protect the axion potential are considered in generality in non supersymmetric models in Ref. [30]. are only satisfied for combinations of a and b such that a + b ≥ 8.…”

Section: B Anomalies and Discrete Symmetriesmentioning

confidence: 99%

Dynamical generation of the Peccei-Quinn scale in gauge mediation

Festuccia

Opferkuch²,

Ubaldi

2015

Phys. Rev. D

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The Peccei-Quinn (PQ) mechanism provides an elegant solution to the strong CP problem. However astrophysical constraints on axions require the PQ breaking scale to be far higher than the electroweak scale. In supersymmetric models the PQ symmetry can be broken at an acceptable scale if the effective potential for the pseudo-modulus in the axion multiplet develops a minimum at large enough field values. In this work we classify systematically hadronic axion models in the context of gauge mediation and study their effective potentials at one loop. We find that some models generate a PQ scale comparable to the messenger scale. Our result may prove useful for constructing full realistic models of gauge mediation that address the strong CP problem. We also comment briefly on the cosmological aspects related to saxion and axino, and on the quality of the PQ symmetry.Comment: 22 pages, 4 figure

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Axion protection from flavor

Cited by 21 publications

References 50 publications

An M theory solution to the strong CP-problem, and constraints on the axiverse

An M theory solution to the strong CP-problem, and constraints on the axiverse

Window for preferred axion models

Dynamical generation of the Peccei-Quinn scale in gauge mediation

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