Laboratory searches for QCD axion dark matter

Abstract

The QCD axion, originally proposed as a solution to the strong-CP problem, is one of the most promising dark matter candidates. Only now after decades of development are experimental techniques beginning to probe the most promising dark matter axion parameter space. Additionally, new ideas are being developed to expand the search for axion dark matter to cover the entire plausible range of axion masses. The state of the current laboratory-based axion searches based on the established haloscope and developing NMR techniques are noted here along with some of the astrophysical searches relevant to dark matter axions.