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The ADMX and BREAD experiments aim to detect this particle by using a strong magnetic field to convert it to photons. For 10 points each:
[10h] Name this hypothetical light dark-matter particle, whose existence was proposed as a consequence of the Peccei–Quinn (“pet-CHAY kwin”) mechanism by Frank Wilczek and Steven Weinberg.
ANSWER: axion [accept higglet; prompt on weakly interacting sub-eV particle or WISP]
[10m] Wilczek named the axion after a detergent brand because it “cleaned up” a problem named for charge conjugation symmetry and this symmetry. Chien-Shiung Wu showed that the weak force violates this symmetry.
ANSWER: parity symmetry [or P-symmetry; accept CP-symmetry; accept, but DO NOT REVEAL, strong-CP problem]
[10e] The Peccei–Quinn mechanism that produces the axion attempts to explain why this fundamental force seemingly does not exhibit CP-violation. This force holds the atomic nucleus together.
ANSWER: strong force [or strong interaction or strong nuclear force]
<Physics>

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Notre DameWashU D001010
Purdue AUIUC B10101030
Indiana BPurdue D0101020
SIUE AUChicago B0101020
UChicago DUIUC D001010
Indiana AUIUC A10101030
UIUC CUChicago A0101020
UChicago CWashU B0101020
WashU CNorthwestern A001010