Axion quality straight from the GUT

Composite axion scenarios offer a robust field theoretic justification for the existence of a Peccei–Quinn symmetry of high quality. We present a new class of realizations that are naturally embedded in Grand-Unified Theories, retain asymptotic freedom for all gauge groups, and protect the axion shi...

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Published in:The European physical journal. C, Particles and fields Vol. 81; no. 10; pp. 1 - 12
Main Author: Vecchi, Luca
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2021
Springer
Springer Nature B.V
SpringerOpen
Subjects:
Analysis
Astronomy
Astrophysics and Cosmology
Couplings
Dark matter
Decay rate
Elementary Particles
Hadrons
Heavy Ions
Leptons
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum chromodynamics
Quantum Field Theories
Quantum Field Theory
Quantum numbers
Quarks
Regular Article - Theoretical Physics
Scalars
Standard model (particle physics)
String Theory
Symmetry
ISSN:1434-6044, 1434-6052
Online Access:Get full text
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Summary:Composite axion scenarios offer a robust field theoretic justification for the existence of a Peccei–Quinn symmetry of high quality. We present a new class of realizations that are naturally embedded in Grand-Unified Theories, retain asymptotic freedom for all gauge groups, and protect the axion shift symmetry up to operators of dimension 12. Our setup leads to a number of distinctive signatures at low energies. First, additional composite scalars are predicted; some of these are viable dark matter candidates for values of the decay constant that are likely too low for the QCD axion abundance to be relevant. Second, an approximate unification of the Standard Model gauge couplings takes place at the axion scale, while leaving the actual quark-lepton unification at much higher energies as usual. This suggests the existence of GUT relics with Standard Model gauge quantum numbers at potentially accessible scales.
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ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-021-09745-x