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Axion Dark Matter
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Axions are well-motivated dark matter candidates with simple cosmological production mechanisms. They were originally introduced to solve the strong CP problem, but also arise in a wide range of extensions to the Standard Model. This Snowmass white paper summarizes axion phenomenology and outlines next-generation laboratory experiments proposed to detect axion dark matter. There are vibrant synergies with astrophysical searches and advances in instrumentation including quantum-enabled readout, high-Q resonators and cavities and large high-field magnets. This white paper outlines a clear roadmap to discovery, and shows that the US is well-positioned to be at the forefront of the search for axion dark matter in the coming decade.
Forward citations
Cited by 12 Pith papers
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Correlated comagnetometry for precision measurements
A dual-alkali single-cell correlated measurement cancels common-mode magnetic background at high frequencies, improving magnetometer SNR and enabling single-cell model differentiation of exotic spin couplings.
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On the Gravitational Origin of the QCD Axion
Derivative-coupled gravitational axions cannot solve the strong CP problem; Weyl-invariant Einstein-Cartan gravity is identified as the only promising framework for a gravitational QCD axion.
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Solar axion searches with RES-NOVA: projected sensitivity and first prototype limit
RES-NOVA's projected 1 ton-year sensitivity reaches within a factor of ~2 of XENONnT on the solar-axion electron coupling, and a 32.4 g-day archaeological-lead prototype excludes new parts of the (g_ae, g_aγ) plane.
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A Simulation Framework for Ramsey Interferometry
RamseyProp plus McStas/COMSOL quantifies that time-dependent RF amplitude modulation reduces zero-detuning flip-angle std from 0.67 to 0.17 rad and improves phase sensitivity ~4× for a 10 m ESS setup.
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High-$Q$ Superconducting Lumped-Element Resonators for Low-Mass Axion Searches
A one-liter superconducting resonator at 250 kHz achieves an unloaded quality factor of about 2.1 million, the highest reported at this frequency and volume.
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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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Axion USR Inflation
In axion inflation with an intermediate ultra-slow-roll phase, the instability parameter collapses at the start of USR, terminating gauge production and yielding a two-peak power spectrum with P_R ∝ k^m, m>4.
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The VORTEX cavity for the RADES axion haloscope
A split-cylinder axion haloscope tunes continuously from 9 to 8.2 GHz with modest Q loss, operates at millikelvin temperatures, and its TM010 field profile passes bead-pull verification.
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Neutrino lines and photon continua from cascade dark matter decay
In cascade dark-matter decay, neutrino-line searches can beat gamma-ray limits whenever the intermediate mediator is long-lived enough to suppress the photon flux.
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Superconducting NbN Resonator Parametric Amplifiers for Millimetre Wavelengths
A niobium-nitride deposition process is reported to yield 10.5 K, ~1000 micro-ohm-cm films whose resonator parametric amplifiers give >20 dB gain at 25 GHz; the attached full text is an unrelated paper.
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Experiments to test the hypothesis for solar and dark matter axions
This is a pedagogical review of haloscope and helioscope experiments searching for dark matter and solar axions, with an overview of near-future technological developments.
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Axion Searches at the CERN SPS: From Their Dawn to Current Prospects
A review of axion and ALP searches at the CERN SPS, covering Barbiellini's 1982 proposal, the CHARM experiment, NA62/NA64 results, and future directions.
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