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Author  |
Di Luzio, L.; Landini, G.; Mescia, F.; Susic, V. |
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Title |
High-quality Peccei-Quinn symmetry from the interplay of vertical and horizontal gauge symmetries |
Type |
Journal Article |
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Year |
2026 |
Publication |
European Physical Journal C |
Abbreviated Journal |
Eur. Phys. J. C |
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Volume |
86 |
Issue |
1 |
Pages |
5 - 55pp |
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Keywords |
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Abstract |
We explore a class of axion models where an accidental U(1) Peccei-Quinn (PQ) symmetry automatically emerges from the interplay of vertical (grand-unified) and horizontal (flavor) gauge symmetries. We study a specific Pati-Salam realization in detail, and aim to generalize the conclusions. We show that our specific model offers protection from PQ-violating operators to high dimension, and demonstrate that the model can reproduce the Standard Model flavor structure. A distinctive feature of the vertical-horizontal setup is the presence of parametrically light fermions, known as anomalons, which are introduced to cancel the gauge anomalies of the flavor symmetry. We also identify a major challenge to building a fully realistic model, most notably that of Landau poles in gauge couplings before the Planck scale. For the specific model investigated, the pre-inflationary PQ-breaking scenario predicts the axion mass window to be ma is an element of [2 x 10(-8,) 10(-3)] eV. Conversely, a high-quality axion may be obtained instead in the post-inflationary scenario, with axion mass ma >= 0.01 eV, and anomalon masses predicted below the eV scale. We elaborate on anomalons' cosmological production in the early universe, highlighting how measurements of Delta N-eff could serve as a low-energy probe of the ultraviolet dynamics addressing the PQ quality problem. |
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Address |
[Di Luzio, Luca] Ist Nazl Fis Nucleare, Sez Padova, Via F Marzolo 8, I-35131 Padua, Italy, Email: luca.diluzio@pd.infn.it; |
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Publisher |
Springer |
Place of Publication |
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Language |
English |
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Original Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1434-6044 |
ISBN |
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Notes |
WOS:001653384400002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7014 |
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