Particle Physics in Birmingham

Particle Physics Seminar

Wednesday 4th February 2015 at 13:30
Poynting Small Lecture Theatre

(tea, coffee and biscuits served at 13:15)

Axionic Dark Matter Search with Josephson Junctions and Squids

Christian Beck (Queen Mary College, London)


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)