High Energy Physics
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Axion Candidate at 1.036 GHz Disconfirmed in Extended Haloscope Search with Improved Limits
Extended haloscope search recovered prior HEMT dataset, identifying an excess near 1.036 GHz that met candidate criteria but failed validation via independent cross-checks and re-examination. Search expanded over 20-MHz band (1.026-1.045 GHz) using quantum-noise-limited amplifier, achieving sensitiv…
8-Cell Cavity Haloscope Sets Toughest KSVZ Axion Limits at 5.9 GHz
An 8-cell microwave resonator haloscope searched for KSVZ axion dark matter near 5.9 GHz, extending frequency range multifold over single-cell designs while preserving detection volume. Sensitivity was boosted by a quantum-limited flux-driven Josephson parametric amplifier and sideband-summing techn…