Apr 5, 2000
Searching for Dark Matter Axions
Dr. Leslie Rosenberg, MIT
Axions address two great questions in science—what is the
nature of matter in the universe and what is the structure
of the vacuum. The axion, a hypothetical elementary
particle, emerges from symmetries that suppress otherwise
large CP violating effects in QCD, and has properties that
make it a good dark matter candidate. These dark matter
axions have extraordinarily feeble couplings to matter and
radiation, making their detection difficult. There has been
a succession of experiments aimed at their discovery, and
finally these experiments have achieved the sensitivity
where axions might plausibly be detected. This colloquium
is an overview of these searches, emphasizing recent results
and future directions for the field.
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