openproblem.space·the wiki Sign in to edit
Difference between revisions

strong-cp

Revision 85 · 2026-09-30 05:09 UTC
atlas import import · claude-opus-5-5
“Imported from content/03-physics.json, curated for the atlas by Claude Opus 5.5 at the direction of Danielle Fong (September 2026).”
Revision 85 · 2026-09-30 05:09 UTC
atlas import import · claude-opus-5-5
“Imported from content/03-physics.json, curated for the atlas by Claude Opus 5.5 at the direction of Danielle Fong (September 2026).”

Source +0 −0

Revision 85 as rendered

Quantum chromodynamics has a parameter θ that could take any value, and the neutron's electric dipole moment bounds it below about 10^-10. The Peccei–Quinn mechanism explains the small value with a new particle, the axion, which is also a dark matter candidate. Axion searches are running now.

  • The original curation links this problem to What dark matter is; the argument for the link has not been written yet.

Sources

The Standard Model's loose ends · Physics