Axion Dark Matter: How to see it?

Understand

The axion is a highly motivated elementary particle which could address two fundamental questions in physics - the strong CP problem and the dark matter mystery.

• Experimental searches for this hypothetical particle have started to reach theoretically interesting sensitivity levels, particularly in the $\mu$eV (GHz) region.
• They rely on large volume solenoid magnetic fields and microwave resonators with signals read out by quantum noise limited amplifiers.
• Concurrently, there have been intensive experimental efforts to widen the search range by devising various techniques as well as to enhance sensitivities by implementing advanced technologies.