Abstract

Axions were originally introduced to solve the strong CP problem, but they are also a very interesting dark matter candidate. I will describe recent theoretical ideas to use S/N/S Josephson junctions as suitable axion detectors, and how possible experimental signatures would look like. A candidate signal of unknown origin observed by an experimental group in Grenoble is discussed. If interpreted as being due to axions it would point towards an axion mass of 0.11 meV and a local axion density of 0.05 GeV/cm^3 [1]. Further tests are still necessary to either confirm or refute the dark matter nature of this and similar signals. [1] C. Beck, Phys. Rev. Lett. 111, 222501 (2013)