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The axion is a hypothetical particle proposed, over 40 years ago, toexplain why the strong interactions are P and CP invariant. Additionalmotivation for the axion derives from the fact that a cold populationof axions is naturally produced in the early universe. These cold axions may constitute the dark matter today. I'll briefly review thelimits on the axion from particle physics, stellar evolution andcosmology. The constraints imply that its interactions are extremely weak, so much so that the axion was once thought "invisible". Nonetheless a number of methods have been proposed to detect so-called "invisible" axions and a world-wide campaign is under way to look for them. I'll describe these techniques, the experiments that implement them, and the results that have been obtained so far.
The colloquium will take place in SR4.
There will be a webcast too, for those who can't make it in person:
https://desy.zoom.us/j/99616528733
Meeting ID: 996 1652 8733
Meeting Password: 733220