A mixed F- and D-term uplift in supergravity evades the Planckian lower bound on the R-axion decay constant, allowing it to be the QCD axion and dark matter.
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Planck-Scale Physics and the Peccei-Quinn Mechanism
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abstract
Global-symmetry violating higher-dimension operators, expected to be induced by Planck-scale physics, in general drastically alter the properties of the axion field associated with the Peccei-Quinn solution to the strong-CP problem, and render this solution unnatural. The particle physics and cosmology associated with other global symmetries can also be significantly changed.
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A 4D moose gauge theory with gauged WZW term deconstructs the 5D orbifold axion, reproducing its shift symmetry, instanton effects, and quality features via collective PNGB dynamics.
A 5D holographic QCD axion model identifies bulk modes for the axion and eta prime, traces the quality problem to insufficient compositeness, and finds the physical axion mostly in the bulk gauge field when quality is high.
All integrable 2D Horndeski theories (and thus many regular black-hole metrics) arise as spherical reductions of pure d≥4 gravities, which the paper terms quasi-topological.
A discrete gauge symmetry protecting the axion induces a large effective mass during inflation via a gauge-invariant PQ-violating operator, suppressing isocurvature fluctuations and addressing both quality and isocurvature issues.
A mirror GUT model confines dynamically to produce a heavy axion solving the strong CP problem while allowing observable EDMs and a rich hidden sector.
Hybrid inflation model with Z_N-symmetric waterfall fields cancels quadratic radiative corrections for any N and logarithmic ones for N>2, yielding a stable inflaton potential and domain-wall-free reheating via Higgs-portal couplings.
The EIC can probe invisible pseudoscalar meson decays down to branching ratios of 10^{-8} and invisibly decaying ALPs with couplings up to 10^5 GeV for masses 0.1-2 GeV.
In asymptotically safe gravity, dimension-five couplings of ultralight scalar dark matter to gauge field strengths vanish and are not generated perturbatively.
Nelson-Barr mechanism yields ultralight scalar dark matter inducing time-periodic variation in CKM matrix elements, distinguishable from QCD axion and detectable via nuclear clocks.
A chiral U(1) gauge symmetry generates an accidental Peccei-Quinn symmetry broken by mirror QCD, solving the strong CP problem without a light axion while supplying WIMP dark matter, stochastic gravitational waves, and LHC-testable colored pNGBs.
Gauged U(1)_F flavor symmetries shield the axion from quantum gravity corrections, yielding unit domain wall number and a plateau-valley GW spectrum from flavonic and axionic strings as a probe of flavored axion dark matter.
In gauged U(1) completions enabling high-quality axion dark matter, cosmic string loops generate a stochastic gravitational wave background with an infrared break frequency that exceeds foregrounds above 10^14 GeV breaking scales and offers a probe at interferometers.
Spontaneous wash-in leptogenesis in Type II Seesaw with Majoron pNGB background enables baryon asymmetry generation alongside dark matter cogenesis for specific v_T, v_sigma and m_j ranges.
Kinetic mixing between hidden-sector fluxes and QCD's topological sector shifts the effective theta angle and produces nonzero <G tilde G>.
Six classes of CP-violating operators near the QCD scale produce distinct EDM patterns that enable discrimination of their origins and can distinguish high-scale versus low-scale sources of axion VEV.
Solar axion-like particles up to 5.5 MeV produce off-axis MeV photons via two-body decay, enabling new space and terrestrial searches that could probe g_aγ down to 10^{-12} GeV^{-1}.
Review classifies QCD axion models extending the standard mass-coupling window and updates bounds from cosmology, astrophysics, and experiments.
citing papers explorer
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An Intermediate Scale R-axion \& the QCD Axion
A mixed F- and D-term uplift in supergravity evades the Planckian lower bound on the R-axion decay constant, allowing it to be the QCD axion and dark matter.
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Deconstructing the Extra-Dimensional Axion
A 4D moose gauge theory with gauged WZW term deconstructs the 5D orbifold axion, reproducing its shift symmetry, instanton effects, and quality features via collective PNGB dynamics.
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The Holographic QCD Axion in Five Dimensions
A 5D holographic QCD axion model identifies bulk modes for the axion and eta prime, traces the quality problem to insufficient compositeness, and finds the physical axion mostly in the bulk gauge field when quality is high.
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All $2D$ generalised dilaton theories from $d\geq 4$ gravities
All integrable 2D Horndeski theories (and thus many regular black-hole metrics) arise as spherical reductions of pure d≥4 gravities, which the paper terms quasi-topological.
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High-Quality Axion Dark Matter without Isocurvature Problem
A discrete gauge symmetry protecting the axion induces a large effective mass during inflation via a gauge-invariant PQ-violating operator, suppressing isocurvature fluctuations and addressing both quality and isocurvature issues.
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Heavy Axion from a Confining Mirror GUT
A mirror GUT model confines dynamically to produce a heavy axion solving the strong CP problem while allowing observable EDMs and a rich hidden sector.
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Pseudo-Nambu-Goldstone inflation with $Z_N$ symmetric waterfall fields
Hybrid inflation model with Z_N-symmetric waterfall fields cancels quadratic radiative corrections for any N and logarithmic ones for N>2, yielding a stable inflaton potential and domain-wall-free reheating via Higgs-portal couplings.
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Braking protons at the EIC: from invisible meson decay to new physics searches
The EIC can probe invisible pseudoscalar meson decays down to branching ratios of 10^{-8} and invisibly decaying ALPs with couplings up to 10^5 GeV for masses 0.1-2 GeV.
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Towards theory constraints on ultralight dark matter from quantum gravity
In asymptotically safe gravity, dimension-five couplings of ultralight scalar dark matter to gauge field strengths vanish and are not generated perturbatively.
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Nelson-Barr ultralight dark matter
Nelson-Barr mechanism yields ultralight scalar dark matter inducing time-periodic variation in CKM matrix elements, distinguishable from QCD axion and detectable via nuclear clocks.
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Accidental Peccei-Quinn Symmetry from Chiral Gauge Symmetry and Mirror QCD
A chiral U(1) gauge symmetry generates an accidental Peccei-Quinn symmetry broken by mirror QCD, solving the strong CP problem without a light axion while supplying WIMP dark matter, stochastic gravitational waves, and LHC-testable colored pNGBs.
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Gravitational Wave Imprints of a High-Quality Axion and the Origin of Flavor Hierarchies
Gauged U(1)_F flavor symmetries shield the axion from quantum gravity corrections, yielding unit domain wall number and a plateau-valley GW spectrum from flavonic and axionic strings as a probe of flavored axion dark matter.
-
High-Quality Axion Dark Matter at Gravitational Wave Interferometers
In gauged U(1) completions enabling high-quality axion dark matter, cosmic string loops generate a stochastic gravitational wave background with an infrared break frequency that exceeds foregrounds above 10^14 GeV breaking scales and offers a probe at interferometers.
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Type II Seesaw Leptogenesis in a Majoron background
Spontaneous wash-in leptogenesis in Type II Seesaw with Majoron pNGB background enables baryon asymmetry generation alongside dark matter cogenesis for specific v_T, v_sigma and m_j ranges.
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Flux Mixing and CP Violation in QCD
Kinetic mixing between hidden-sector fluxes and QCD's topological sector shifts the effective theta angle and produces nonzero <G tilde G>.
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The EDM inverse problem: Identifying the sources of CP violation and PQ breaking with electric dipole moments
Six classes of CP-violating operators near the QCD scale produce distinct EDM patterns that enable discrimination of their origins and can distinguish high-scale versus low-scale sources of axion VEV.
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Looking for Lights from the Darkness: Signals from MeV-scale Solar Axion-like Particles
Solar axion-like particles up to 5.5 MeV produce off-axis MeV photons via two-body decay, enabling new space and terrestrial searches that could probe g_aγ down to 10^{-12} GeV^{-1}.
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The landscape of QCD axion models
Review classifies QCD axion models extending the standard mass-coupling window and updates bounds from cosmology, astrophysics, and experiments.
- Big Axions
- Specially Embedding a Composite Axion Model