Heterotic string theory implies the QCD axion mass is bounded below by 0.5 neV and typically falls in [0.5, 0.8] neV across most compactifications.
Giaccone et al.,Design of axion and axion dark matter searches based on ultra high Q SRF cavities, arXiv:2207.11346
3 Pith papers cite this work. Polarity classification is still indexing.
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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.
Analytical modeling suggests iron-based superconductor multilayers can sustain higher magnetic fields with lower surface resistance than bulk niobium for SRF applications.
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Analytical evaluation of surface barrier and resistance in iron-based superconducting multilayers for Superconducting Radio-Frequency applications
Analytical modeling suggests iron-based superconductor multilayers can sustain higher magnetic fields with lower surface resistance than bulk niobium for SRF applications.