QCD axion dark matter from a late time phase transition

Harigaya, Keisuke; Leedom, Jacob M.

doi:10.1007/jhep06(2020)034

Cited by 27 publications

(23 citation statements)

References 91 publications

(124 reference statements)

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“…This requires a flat potential for S, which is natural in supersymmetry theories. The rotation of P may create ALP fluctuations by parametric resonance [72][73][74][75], and the fluctuations may contribute to dark matter [76][77][78] with an abundance similar to or larger than the abundance given by kinetic misalignment, for = O(1) or 1, respectively. For the latter case the prediction for f a becomes even smaller.…”

Section: Initiation Of Non-zero Alp Velocitymentioning

confidence: 99%

Predictions for axion couplings from ALP cogenesis

Hall

Harigaya

2021

J. High Energ. Phys.

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Adding an axion-like particle (ALP) to the Standard Model, with a field velocity in the early universe, simultaneously explains the observed baryon and dark matter densities. This requires one or more couplings between the ALP and photons, nucleons, and/or electrons that are predicted as functions of the ALP mass. These predictions arise because the ratio of dark matter to baryon densities is independent of the ALP field velocity, allowing a correlation between the ALP mass, ma, and decay constant, fa. The predicted couplings are orders of magnitude larger than those for the QCD axion and for dark matter from the conventional ALP misalignment mechanism. As a result, this scheme, ALP cogenesis, is within reach of future experimental ALP searches from the lab and stellar objects, and for dark matter.

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Section: Initiation Of Non-zero Alp Velocitymentioning

confidence: 99%

Predictions for axion couplings from ALP cogenesis

Hall

Harigaya

2021

J. High Energ. Phys.

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“…This mass scale m a ¼ Oð0.1 − 100Þ meV is under extensive experimental investigation [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. Other known production mechanisms in this mass range are (1) parametric resonance from a PQ symmetry breaking field [39,40], (2) anharmonicity effects [41][42][43] when θ i approaches π due to fine-tuning or inflationary dynamics [44,45], (3) decays of unstable domain walls [46][47][48][49][50][51][52][53], and (4) production during a kination era [54]. Contrary to these mechanisms, kinetic misalignment offers an exciting theoretical connection with the baryon asymmetry of the Universe through so-called axiogenesis [55].…”

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confidence: 99%

Axion Kinetic Misalignment Mechanism

2020

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In the conventional misalignment mechanism, the axion field has a constant initial field value in the early Universe and later begins to oscillate. We present an alternative scenario where the axion field has a nonzero initial velocity, allowing an axion decay constant much below the conventional prediction from axion dark matter. This axion velocity can be generated from explicit breaking of the axion shift symmetry in the early Universe, which may occur as this symmetry is approximate.

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“…• After the field starts rotating, depending on the shape of the potential and the rotations, parametric resonance (PR) [27][28][29][30] may be effective at producing axions. If not thermalized, these axions contribute to the dark matter density [31,32] and may be warm enough to affect structure formation at an observable level.…”

Section: Jhep03(2021)017mentioning

confidence: 99%

Lepto-axiogenesis

Fernandez

Ghalsasi

et al. 2021

J. High Energ. Phys.

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120

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We propose a baryogenenesis mechanism that uses a rotating condensate of a Peccei-Quinn (PQ) symmetry breaking field and the dimension-five operator that gives Majorana neutrino masses. The rotation induces charge asymmetries for the Higgs boson and for lepton chirality through sphaleron processes and Yukawa interactions. The dimension-five interaction transfers these asymmetries to the lepton asymmetry, which in turn is transferred into the baryon asymmetry through the electroweak sphaleron process. QCD axion dark matter can be simultaneously produced by dynamics of the same PQ field via kinetic misalignment or parametric resonance, favoring an axion decay constant fa ≲ 1010 GeV, or by conventional misalignment and contributions from strings and domain walls with fa ∼ 1011 GeV. The size of the baryon asymmetry is tied to the mass of the PQ field. In simple supersymmetric theories, it is independent of UV parameters and predicts the supersymmtry breaking mass scale to be $$ \mathcal{O} $$ O (10 − 104) TeV, depending on the masses of the neutrinos and whether the condensate is thermalized during a radiation or matter dominated era. The high supersymmetry breaking mass scale may be free from cosmological and flavor/CP problems. We also construct a theory where TeV scale supersymmetry is possible. Parametric resonance may give warm axions, and the radial component of the PQ field may give signals in rare kaon decays from mixing with the Higgs and in dark radiation.

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QCD axion dark matter from a late time phase transition

Cited by 27 publications

References 91 publications

Predictions for axion couplings from ALP cogenesis

Predictions for axion couplings from ALP cogenesis

Axion Kinetic Misalignment Mechanism

Lepto-axiogenesis

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