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Axions In String Theory
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In the context of string theory, axions appear to provide the most plausible solution of the strong CP problem. However, as has been known for a long time, in many string-based models, the axion coupling parameter F_a is several orders of magnitude higher than the standard cosmological bounds. We re-examine this problem in a variety of models, showing that F_a is close to the GUT scale or above in many models that have GUT-like phenomenology, as well as some that do not. On the other hand, in some models with Standard Model gauge fields supported on vanishing cycles, it is possible for F_a to be well below the GUT scale.
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Showing 60 of 109 Pith papers that cite this
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Big Axions
Big axions are axion models from collective spontaneous breaking of a delocalized network of U(1) symmetries that realize high-quality accidental global symmetries, solve the strong CP problem, and may explain dark matter.
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Fuzzy Axions and Associated Relics
In explicit string theory compactifications, fuzzy axion dark matter is rare and typically requires fine-tuning of initial axion displacements or a non-standard reheating epoch to avoid overproducing heavier axions.
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Axion-driven spontaneous leptogenesis, precisely
Standard-misalignment axions coupled to strong or weak sphalerons can produce the observed baryon asymmetry at GUT-scale decay constants, whereas the vanilla Majoron scenario is ruled out by late-time dilution.
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Extra-dimensional Origins of Chemical Potentials at the Cosmological Collider
A rolling 5D gauge-field inflaton acts as an extra-dimensional electric field, creating charged and neutral KK particles far heavier than H and yielding observable oscillatory signatures.
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The Dark Dimension meets the Axiverse
Dark dimension dark matter can evade decay constraints if N≳50 axion KK towers share the tower energy, diluting Standard Model energy injection by roughly 1/N.
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Axion Misalignment Across First-Order Phase Transitions
Lattice simulations show axion misalignment production splits into two regimes during first-order phase transitions, unified by a semi-analytical relic density formula that also alters isocurvature and small-scale pow...
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Cascading amplification of gravitational waves triggered by environment in dynamical Chern-Simons gravity
An external dynamical environment forms a resonant cavity with a black hole in dCS gravity that triggers Mathieu instability in the scalar sector, producing cascading amplification of gravitational waves via a delayed...
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A Bandpass Axion Or: How I Learned To Stop Worrying About Stars And Love The Lab
Axion-photon coupling from non-anomalous PQ symmetry with charged light fermions acts as bandpass filter, making lab constraints dominant for most axion masses.
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Artificial Precision Polarization Array: Sensitivity for the axion-like dark matter with clock satellites
Proposes satellite-based artificial pulsar polarization arrays (APPA) that simulations show can set tighter 95% C.L. upper limits on g_aγ than ground observations for axion masses 10^{-22} to 10^{-18} eV.
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Quantum Error Correction-like Noise Mitigation for Wave-like Dark Matter Searches with Quantum Sensors
A repeated syndrome-correction protocol on multi-sensor quantum arrays suppresses individual excitation noise, yielding a √N sensitivity gain at small N and standard-quantum-limit sensitivity at large N even though th...
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Growth of Structure in Multi-species Wave Dark Matter
Derives the power spectrum evolution and cross-spectra for arbitrary multi-species wave and particle dark matter, incorporating free-streaming, Jeans scales, and intrinsic fluctuations.
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Heterotic Warm Inflation
In a heterotic-string-inspired two-field warm inflation model, the axion drives inflation while thermal corrections from gauge fields block sustained dilaton-driven inflation.
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Ultralight Boson Ionization from Comparable-Mass Binary Black Holes
Ionization of boson molecules bound to a black hole binary can dominate gravitational-wave losses during early inspiral, imprinting a turnover in the nanohertz GW background and circularizing the orbit.
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Abelian-Higgs vortices in the oscillating axion background
Axion oscillations can resonantly amplify electric fields inside Abelian-Higgs vortex cores and induce attractive or repulsive forces between vortices, even in the BPS limit.
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Co-Scaling and Alignment of Electric and Magnetic Towers
Electric and magnetic BPS towers in 5d supergravity are conjectured to co-scale and align, and a new S-map is conjectured to characterize the magnetic infinity cone of a Calabi-Yau threefold.
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Broadband Search for Axion Dark Matter via Shift Current
A proposed axion haloscope using shift-current difference frequency generation in the Weyl semimetal TaAs could probe QCD axions at 10-100 meV, assuming a 10^8 V/m, 100 ps THz drive field is achievable.
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Accurate method for ultralight axion CMB and matter power spectra
AxiECAMB computes CMB and matter power spectra for ultralight axions across 10^-33 to 10^-18 eV by time-averaging fast field oscillations, with metric and fluid matching that reduces errors far below cosmic variance f...
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Chiral Gravitational Wave Background from Audible Axion via Nieh-Yan Term
Axion-like fields coupled to the Nieh-Yan term generate a chiral GW background during radiation domination, with parameter space explored for detectability in PTA and space-based observatories.
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String Axiverse
String theory predicts an axiverse of ultralight axions whose effects on CMB polarization, matter power spectrum, and black hole superradiance can be probed by future astrophysical experiments.
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Reflection polarization of close binaries as a probe of axion dark matter birefringence
Phase-locked reflection polarization in close binaries can probe axion-photon coupling near 10^{-12} (single) to 10^{-13} GeV^{-1} (array) at ~10^{-20} eV via orbital-harmonic sidebands.
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3-form dark energy and cosmic birefringence
3-form dark energy can explain cosmic birefringence with a dimension-4 photon coupling, yielding redshift profiles that can mimic or differ from axion dark energy, but the implied photon mass estimate is numerically shaky.
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Axion Inflation with a Massive Abelian Gauge Field
A massive Abelian gauge field axially coupled to the inflaton yields tachyonic production only for |ξ|>m/H, with sourced CMB curvature power suppressed as ~1/m̄²–1/m̄³ at fixed backreaction, allowing strong friction f...
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Constraining axion quadratic couplings with the Hulse-Taylor binary system
Orbital timing of the Hulse-Taylor binary pulsar gives the strongest published limits on quadratic axion-muon couplings for axion masses below about 10^-12 eV, and complementary limits on axion-neutron and axion-elect...
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Axion isocurvature and the model-building problem of low-scale inflation
A light pre-inflationary QCD axion that is all the dark matter forces the inflationary Hubble scale below ~10^7–10^10 GeV and, for canonical slow-roll inflation, confines the inflaton to sub-10^-4 M_Pl of field motion...
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ALP pair production at the LHC
Non-resonant gg→aa→4γ production could constrain the dimension-6 ALP-gluon coupling down to ~10^-3 TeV^-2 at 300 fb^-1, but the allowed parameter space remains unbounded along multiple flat directions.
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Extreme mass-ratio inspirals into Newtonian Proca stars
For Newtonian Proca stars, a perturbing object on a circular orbit loses nearly the same energy in the vector ground state as in the scalar boson-star ground state (within ~20%), while the spherical excited Proca stat...
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The $H_0$ world cup. II. A comprehensive competition between proposed Hubble tension solutions
Against a common 2025-26 dataset (Planck PR4, ACT DR6, SPT-3G, DESI DR2, Pantheon+), early dark energy and early modified gravity models win the H0 competition (~3σ residual tension), while radiation and late-time sol...
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Axions on de Sitter space
Quantization of axions on dS_D yields Hilbert space H = L^2(S^1) ⊗ F with zero-mode U(1) charge, producing non-dS-invariant charged sectors and Hadamard Wightman functions that become asymptotically invariant.
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Non-invertible symmetries in the axiverse, and the imaginary wormholes
Imaginary wormholes and the IDB imply that towers of BPS EFT instantons generate infinitely many superpotential terms that break non-invertible axion shift symmetries in N=1 axiverse models.
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String Axiverse Enhancement of Superradiant Dark Matter Production
O(100-10^5) string axions enhance PBH superradiance efficiency via increased spin, expanding viable mass-spin regions for micro-boson star dark matter while too many axions cause overly rapid evaporation.
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Probing Axion Dark Matter via the Chiral Magnetic Effect in Zero-Bias Weyl Semimetals
Proposal to detect axion dark matter via chiral magnetic effect in Weyl semimetals, claiming observable femto-amp signals in 1 cm² samples at 10 T that can probe couplings below stellar cooling bounds.
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Testing F-theory GUTs with the Axiverse
In F-theory GUTs, non-universal ALPs induced by hypercharge flux satisfy g_aγ/m_a well below the QCD axion prediction when gauge couplings unify near the string scale.
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Searches for GeV-Scale ALPs at RHIC
Proposes searching for GeV-scale ALPs in ultra-peripheral collisions at RHIC via γγ → a → γγ, estimating sensitivity to m_a ~2-5 GeV and g_aγγ ≳4e-4 GeV^{-1} with existing PHENIX data.
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How Much Can Gravitons Be Squeezed?
Superradiant axion-like-particle clouds around rotating black holes can generate multimode squeezed graviton states with 10^6-10^7 correlated quanta showing polarization correlations and quantum-noise signatures poten...
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The structure of multi-axion solutions to the strong CP problem
Multi-axion theories solving the strong CP problem produce varied mass-coupling relations via a general sum rule that depends on the details of PQ symmetry breaking and anomaly alignments.
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Searching for axions with time resolved pulsar polarimetry
Time-resolved optical polarimetry of the Crab pulsar is used to place bounds on the axion-photon coupling via oscillating axion fields induced by the pulsar's magnetic field.
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Axiverse Lampposts
In a hierarchical multi-axion theory with random couplings, axion field ranges shrink with 1/sqrt(N), generic axion–SM couplings are suppressed, but the QCD axion's coupling is unsuppressed.
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Beyond thermal approximations: Precise cosmological bounds on Axion-Like Particles
Solving the momentum-dependent Boltzmann equation and propagating the exact non-thermal ALP spectrum into CMB analyses yields 95% limits f_a>1.63e6 GeV (e), 9.41e6 GeV (mu), 8.06e4 GeV (tau), and g_a_gamma<1.98e-8 GeV^-1.
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Constraints on Axion-Like Particles with the Silicon Detector at a Nuclear Reactor
New 90% C.L. limits on the ALP–photon coupling in the 0.1–100 keV range are derived from Connie and Atucha-II reactor data via plasmon excitation in silicon; a 30 kg·yr Oscura-style run could improve on NEON by about tenfold.
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Axion-photon conversion in stochastic magnetic fields
Axion-photon conversion in random Gaussian magnetic fields fixes the expectation values and variances of photon Stokes parameters, including a circular-polarization signal from helical fields.
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Stellar Superradiance and Low-Energy Absorption in Dense Nuclear Media
Collective nucleon scattering in neutron-star matter suppresses the effective absorption of ultralight bosons at the long wavelengths relevant for superradiance, weakening the link between stellar cooling bounds and s...
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Searching for Ultralight Dark Matter with MOLeQuTE: a Massive Optically Levitated Quantum Tabletop Experiment
A proposed optically levitated milligram-scale plate sensor could reach the standard quantum limit and probe new parameter space for ultralight B-L vector dark matter.
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Periodic Gravitational Lensing with Oscillating Boson Stars
Oscillating boson stars should produce periodic gravitational lensing: phase-locked photometric spikes and astrometric wobbles as a radial caustic pulses.
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The dark dimension, proton decay, and the length of the M-theory interval
Proton decay limits force the M-theory interval in heterotic E8×E8 compactifications to be R ≲ 2.7×10^-28 m, ruling it out as a micron-sized dark dimension.
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The String Theory Photoverse
Massless string-theory hidden photons acquire dimension-six dipole couplings to SM fermions with suppression scale Λ = αM_s, converting dipole measurements into constraints on the string scale.
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Multimodal axion emissions from Abelian-Higgs cosmic strings
Lattice simulations of Abelian-Higgs cosmic strings with axion-gauge coupling show multimodal axion production that can account for GeV-scale dark matter while predicting observable dark radiation.
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Searching for dark photon dark matter from terrestrial magnetic fields
New upper limits on the dark photon kinetic mixing parameter ε are derived from geomagnetic data for masses between 1e-15 and 2e-13 eV, improving prior ground-based constraints.
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Towards a Heterotic Axiverse
Generic heterotic axions are heavier than in type IIB; the Strong CP problem is typically unsolved, and a light fuzzy dark matter axion requires a no-gaugino-condensation anisotropic fibred Calabi-Yau.
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Axion lines from nuclear de-excitations in galactic stellar populations
No 14.4 keV axion line from 57Fe de-excitations is seen by NuSTAR toward M87, M82, M31, or the Galactic Center, yielding |g_ann x g_aγγ| < 1.1e-22 GeV^-1 for m_a < 1e-10 eV.
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Resonant enhancement of axion dark matter decay
Resonant cavities enhance axion dark matter decay to two photons via the Purcell effect, offering a competitive search method implementable with pre-existing heterodyne detection schemes.
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Universality in the Axiverse
Normalized divisor volumes in toric Calabi-Yau threefolds appear universal, and a GOE level-spacing model with a fitted mean reproduces axion statistics across the Kreuzer-Skarke axiverse.
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Probing Fundamental Constant Oscillation in the Galactic Center with S-Star Spectroscopy
Time-resolved spectroscopy of S-stars around Sgr A* can probe oscillations of the fine-structure constant induced by superradiant axion clouds or dark-matter soliton cores, with future instruments potentially reaching...
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Resonant Landau-Zener Conversion In Multi-Axion Systems
The paper derives a Landau-Zener conversion probability for non-adiabatic axion mass-level crossings and uses it to predict two-axion dark matter abundances and haloscope targets.
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Constraining the axiverse with reionization
Roughly 10 to 15 percent of explicit string theory axiverse models are disfavored by CMB reionization data unless reheating stayed below about 10^10 GeV.
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Dynamical-System analysis of single-axion monodromy inflation with periodically-modulated potentials
For single-axion potentials of the form Λ0^3 b + Λ1^4 cos(b/fb), the paper classifies the fixed points of the Friedmann-Klein-Gordon dynamics into stable nodes/spirals, saddles, and a bifurcation at |γ/δ|=1.
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String Theory and Grand Unification Suggest a Sub-Microelectronvolt QCD Axion
String-theoretic axions consistent with grand unification and proton decay are predicted to have masses in the 3e-11 to 1e-8 eV window, with at most 47 axions in the Kreuzer-Skarke ensemble.
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AdS3 axion wormholes as stable contributions to the Euclidean gravitational path integral
The paper shows that Euclidean axion wormholes remain regular and stable in AdS3 for any mouth radius to AdS radius ratio and across topologies, with computable actions that can be included in the 3D gravitational pat...
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Exploring Constraints on Axion-like Particles with the Observations for blazar Mrk 501
The ALP parameter constraints derived from Mrk 501 gamma-ray spectra vary by orders of magnitude depending on whether the jet emission is leptonic or hadronic and on the jet magnetic field geometry.
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Analysis of axion-like particles in a top-quark pair production at the CLIC
A simulation shows the CLIC gamma-gamma mode could exclude ALP-top couplings down to about 0.11 TeV^-1 for ALP masses near 10 GeV.
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Forecast constraints on the axion-photon coupling from interstellar medium heating
Axion dark matter resonantly heats interstellar plasma when its mass matches the plasma frequency, yielding forecast upper limits on the axion-photon coupling g as strong as about 2e-14 GeV^-1 for a 1 microgauss field.
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