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.
Overview of the Cosmic Axion Spin Precession Experiment (CASPEr)
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abstract
An overview of our experimental program to search for axion and axion-like-particle (ALP) dark matter using nuclear magnetic resonance (NMR) techniques is presented. An oscillating axion field can exert a time-varying torque on nuclear spins either directly or via generation of an oscillating nuclear electric dipole moment (EDM). Magnetic resonance techniques can be used to detect such an effect. The first-stage experiments explore many decades of ALP parameter space beyond the current astrophysical and laboratory bounds. It is anticipated that future versions of the experiments will be sensitive to the axions associated with quantum chromodynamics (QCD) having masses $\lesssim 10^{-9}~{\rm eV}/c^2$.
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Dark matter is composed of composite quark-antiquark objects stabilized by axion domain walls, offering a unified account of dark matter and baryon asymmetry.
Reactor-adjacent CsI(Tl) detector achieves low MeV background enabling projected sensitivity to g_aγγ ≳ 10^{-6} and 10^{-8} < g_aee < 10^{-4} for 1 keV–10 MeV ALPs.
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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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QCD-driven dark matter: AQNs formation and observational tests
Dark matter is composed of composite quark-antiquark objects stabilized by axion domain walls, offering a unified account of dark matter and baryon asymmetry.
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Reactor-based Search for Axion-Like Particles using CsI(Tl) Detector
Reactor-adjacent CsI(Tl) detector achieves low MeV background enabling projected sensitivity to g_aγγ ≳ 10^{-6} and 10^{-8} < g_aee < 10^{-4} for 1 keV–10 MeV ALPs.